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A bold, dark, and wildly inventive survival romance set on an alien world - absolutely gripping if you want rich world-building and flawed, raw characters, but editing mishaps and rough relationships may test your patience. If you love gritty sci-fi with an edge, it’s a wild ride worth taking!

If you liked Planet Zero, here are the top 100 books to read next:

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Showing 1 - 10 of 100 
  1. #1
    Homebound
    by: 
    Book 1 in the series:Rix Universe

    Homebound - Rix Universe by Lydia Hope
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    A dark, emotionally charged slow-burn with heart and depth - perfect for readers craving unique alien romance and don’t mind a bit of grit (and some rough edges). If you can overlook the editing issues and want a story about kindness blooming in dire places, this one’s for you!

    Homebound by Lydia Hope is a science fiction romance set on a dystopian Earth. The story follows Gemma, a prison guard at a human and alien prison, who forms a deep connection with an alien prisoner named Simon. The book explores their evolving relationship, the challenges they face in a corrupt and harsh environment, and the mysterious world they inhabit. Despite some flaws in writing style and world-building, the plot captivates readers with its strong characters and unique setting.

    Back then, no taxpayer money had been spared on the prison’s construction. Copious amounts of reinforced concrete had been poured in a precise fashion to resemble a medieval castle, and the resulting...
    January 2020
    536 pages

  2. #2

    Cottonwood by R. Lee Smith
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    Dark, gripping, and challenging - Cottonwood is one of the most unique and emotionally intense sci-fi romances out there, but make sure to check the trigger warnings before diving in.

    Cottonwood by R. Lee Smith is a sci-fi novel that delves into the world of aliens who are stranded on Earth, particularly focusing on the immigration camp of Cottonwood. The story follows Sanford, an alien bug and former soldier, who is struggling to ensure the safety and well-being of his son T'aki in a disheartening environment. The book explores themes of racism, gender identity, and sexism, while also showcasing the rich character development and intricate relationships between the human caseworker, Sarah, and the alien residents of Cottonwood.

    The writing style in Cottonwood is described as phenomenal, with exceptional world-building and characterizations. The author skillfully weaves together a narrative that not only presents heavy topics like racism and exploitation but also highlights the resilience, compassion, and hope that emerge in the face of adversity. The book is praised for its originality, natural character quirks, and the way it immerses readers into a complex and thought-provoking story.

    It was almost seven o’clock on a Wednesday morning, which found Sarah Fowler sitting at the kitchen table, drinking coffee and reading the help-wanted ads and singing under her breath in no particular...
    February 2013
    467 pages

  3. #3

    The Last Hour of Gann by R. Lee Smith
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    A sprawling, brilliant, gut-punch of a sci-fi saga with a unique romance - unforgettable, disturbing, and definitely not for the faint of heart. Read the content warnings first!

    'The Last Hour of Gann' by R. Lee Smith is a lengthy science fiction novel set in a post-apocalyptic world with elements of romance and redemption. The story follows a group of survivors, including the practical and determined Amber, who crash-land on an alien planet and must navigate a new society led by the lizardman Meoraq. The book delves into themes of survival, clash of cultures, and the complexities of relationships amidst graphic scenes of violence and sexual content.

    The eviction notice was hanging on the door when they got back from the hospital. The time stamp said 1:27 am, six minutes after Mary Shelley Bierce’s official time of death, an hour and twenty-eight...
    September 2013
    704 pages

  4. #4
    Mercy
    Book 1 in the series:Deridia

    Mercy - Deridia by Catherine Miller
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    A tender, character-driven alien romance with a unique POV and a slow-burn charm - lovely if you’re here for sweet healing, but skip if you crave detailed settings, spicy scenes, or fast-paced drama.

    "Mercy" in the series "Deridia" by Catherine Miller is a story set on an alien world where survival and prejudice are prevalent themes. The plot revolves around Prim, a woman without hope or peace, who takes a chance on a new life with a people who view her with disdain. Rykkon, the healer of his people, is a lonely individual until Prim offers herself to him, leading to a quest for fulfillment in their lives. The story is narrated solely from Rykkon's perspective, showcasing his inspiring character and the growth of both protagonists as they navigate through discrimination and find happiness amidst sadness.

    He should have gone with his brethren. The warriors, with faces tight and drawn, had buckled their weapons and departed the village, the great plume that reached from the Wastes and deadened the sky r...
    July 2016
    419 pages

  5. #5
    Saving Askara
    by: 
    Book 1 in the series:Saving Askara

    Saving Askara - Saving Askara by J.M. Link
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    A wildly inventive, genuinely alien romance with great world-building; perfect if you want something new and aren't fazed by body weirdness or cliffhangers. Worth a try for sci-fi romance readers looking for a fresh, non-human twist!

    In "Saving Askara" by J.M. Link, a first contact story unfolds as humans and the alien race of Askarians navigate their interactions. Tori, a doctor on an Earth spaceship, becomes the reluctant liaison between the two species as she assists the Askarians, particularly Aderus, a warrior from a complex and aggressive society. The book explores the challenges of understanding and communicating with a truly alien race, while also delving into the complexities of developing relationships across different worlds.

    The author's writing style in "Saving Askara" is praised for its ability to create a believable and intriguing sci-fi romance narrative. Readers appreciate the well-developed characters, the slow burn romance between Tori and Aderus, and the immersive world-building that highlights the differences in behavior and culture between humans and the Askarians. The book's plot, which includes elements of suspense, romance, and inter-species diplomacy, keeps readers engaged and eager to see how the relationships and conflicts evolve.

    Dr. Victoria Davis fidgeted nervously as she felt the shuttle dock with the south gate of the Amendment. It was the largest Earth-orbiting maintenance station, though the occupant ship was anything bu...
    February 2018
    205 pages

  6. #6
    Ensnared
    Book 1 in the series:The Spider's Mate

    Ensnared - The Spider's Mate by Tiffany Roberts
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    Surprisingly sweet and original, "Ensnared" wins with slow-burn romance and creative world-building. Approach with an open mind (and no severe arachnophobia), and you might just fall for a spider hero!

    Ensnared by Tiffany Roberts is a captivating science fiction romance novel that follows the unlikely relationship between Ketahn, a male weaver and hunter for the Vrix people, and Ivy Foster, a human from a colonization project on another planet. The book intricately weaves together elements of alien cultures, language barriers, and survival lessons as Ketahn and Ivy navigate their differences and learn to communicate in order to coexist in the Tangle, a vast jungle on Ketahn's planet. The slow-burn romance between the two protagonists is beautifully portrayed, with a mix of adorable moments and hot, spicy resolutions that keep readers hooked until the very end.

    The world-building in Ensnared is exceptional, with Tiffany Roberts crafting a rich and detailed planet filled with unique flora, fauna, and mythos. The story unfolds with a perfect balance of action, adventure, and exotic romance, keeping readers entrapped in the journey of Ketahn and Ivy. The writing style is engaging and immersive, painting a vivid picture of the characters and their surroundings, while also delving into complex themes of culture, communication, and understanding in a fantastical setting.

    Moonfall Tunnel was all but deserted as Ketahn strode along it. The soft glow of the spiritcap mushrooms growing on the rough-hewn stone could not banish the dancing shadows cast by the blue-green spi...
    May 2021
    349 pages

  7. #7
    Cassandra's Challenge
    by: 
    Book 1 in the series:Imperial

    Cassandra's Challenge - Imperial by M.K. Eidem
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    A hefty, heartfelt sci-fi romance adventure that packs in drama and love - just be ready for a long read with a few bumps along the way.

    Cassandra's Challenge is a sci-fi romance novel that follows the journey of Cassandra, William, and their family as they navigate a dangerous world filled with friends, enemies, and challenges. The plot involves an attack on Earth, leading to Cassandra and her niece becoming the last survivors. Despite some grammar issues, the book is described as a long but captivating story that blends action, romance, and mystery.

    April 2013
    721 pages

  8. #8
    Xora
    Book 1 in the series:Vrisha Warriors

    Xora - Vrisha Warriors by Olivia Riley
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    A refreshingly realistic and immersive sci-fi romance with a grumpy/sunshine slow burn at its heart. If you enjoy detailed world-building, true relationship development, and actual alien aliens, Xora is a must-read!

    'Xora' in the series 'Vrisha Warriors' by Olivia Riley follows the story of Xora, a warrior who is stripped of his rank and placed on regular work duty as a punishment. When given a chance to redeem himself with a serious mission to retrieve crystals, Xora reluctantly accepts. The plot unfolds in a deep underwater environment, where Xora is forced to work alongside humans, including Grace. As they slowly develop a relationship and fall in love, the story combines elements of sci-fi, romance, and action, creating a unique and engaging narrative. The writing style captures the slow build of the romance, the character development, and the deepening relationship between Xora and Grace, all set against a backdrop of intergalactic cooperation and adventure.

    The planet was on fire. Flakes of ash and embers scorched the dry air, whipping up into the sky from the furious winds. The ground was scorched and barren, nothing more than coal-black rock. Lava spat...
    October 2021
    298 pages

  9. #9

    Stolen by the Warlord - Ash Planet Warriors by V.K. Ludwig
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    An addictive, spicy sci-fi romance with great world-building and a fiercely capable heroine. It’s a wild ride that’s not for the fainthearted, but perfect if you crave intense alien love stories and political intrigue.

    'Stolen by the Warlord' in the series 'Ash Planet Warriors' by V.K. Ludwig follows the story of Toagi, a self-proclaimed warlord of a banished clan on the planet Solgad. Accused of killing his brother, Toagi is an outcast seeking power in the midst of a struggle on the harsh planet. When he steals the bride of a legitimate warlord, Ceangal, a human daughter of an ambassador, their love-hate relationship unfolds amidst a backdrop of power dynamics and alien romance. The author, V.K. Ludwig, expertly crafts a deep and immersive sci-fi world with well-established characters and dynamic relationships, where consequences drive the narrative forward.

    The narrative of 'Stolen by the Warlord' delves into the complexities of relationships and power dynamics on the planet Solgad, where Toagi and Ceangal navigate a world of betrayal, coercion, and ultimately, understanding. Ludwig's writing style effectively blends elements of sci-fi, romance, and adventure, creating a fast-paced story that keeps readers engaged with its well-written adult scenes and intricate world-building. explores themes of loyalty, leadership, and the blurred lines between love and power, making it a compelling read for fans of sci-fi romance and adventure.

    Clammy fingers ran along the golden chain of my necklace, the metal growing hot at the friction. Back and forth they went, the pendant engraved with the crest of my house clanking to the ragged beat o...
    June 2021
    253 pages

  10. #10
    Convergence
    Book 1 in the series:Intersolar Union

    Convergence - Intersolar Union by Etta Pierce
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    A smart, compelling sci-fi romance with incredible world-building and truly alien characters - perfect for readers craving fresh takes on the genre and slow-burn chemistry. Highly recommended for interstellar romance fans!

    'Convergence' in the 'Intersolar Union' series by Etta Pierce follows the story of Dr. Loxley, a profiler behaviorist who is abducted from Earth to help an alien species prevent human trafficking. The plot delves into the rehabilitation and settlement of rescued humans on a new planet, showcasing the protagonist's adaptation and the intricate dynamics between different species. The romance element between Dr. Loxley and Thel, the alien abductor, is a slow burn that builds over time, intertwined with the sci-fi elements and world-building that keep readers engaged and invested in the story.

    The writing style of 'Convergence' is praised for its well-developed characters, including a smart and flexible female protagonist, Olivia, who navigates the challenges of the alien universe with resilience and logical thinking. The diverse ensemble of characters on the ship, the unique alien races, and the mid-level steamy romance add depth to the narrative, making it a compelling blend of sci-fi and romance genres that captivates readers with its mystery, tension, and gradual unfolding of emotions.

    April 2021
    336 pages

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