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To Tread Obsidian Shores
Why Read This?The one-sentence sell. What do you get for showing up to this book, even when it's hard?
A military sci-fi that earns its emotional punches through characters you genuinely root for. The romance is woven into the fabric of the story rather than bolted on, with two veteran authors who balance action and heart perfectly.
Synopsis
WHAT DOES IT MEAN TO BE A WARRIOR? The Protectorate of Mars Foreign A path to citizenship. A fresh start. Defending the Protectorate of Mars against all enemies, foreign and domestic. HOPE With itchy feet and a vagabond soul, all Blue ever wanted was to join the Survey Corps and explore the universe. But when she failed the entry exam, becoming a dropship pilot for the Legion was her last chance at achieving that dream. It was only supposed to be a stepping stone . . . DUTY All he ever wanted was a home. But when Tavi is driven from his world by murderous revolutionaries, he only has one chance to the Legion. Searching for a new life, he soon discovers something even better—a family. WELCOME TO THE LEGION At the publisher's request, this title is sold without DRM (Digital Rights Management). Jason Cordova is both a John W. Campbell Award and Dragon Award finalist. He edited his first anthology, Chicks in Tank Tops , coauthored Monster Hunter Fever with Larry Correia, and wrote Mountain of Fire in the Black Tide Rising universe, all with Baen Books. He has 28 novels currently in print and has been featured in numerous anthologies. A Navy veteran, he is also a former middle school teacher. Though Californian by birth, he has since relocated to the South, where he swears at the humidity on a thrice-daily basis. He can be found at www.jasoncordova.com. Melissa Olthoff . is a science fiction and fantasy author who delights in sneaking in romance wherever she can. She is a lifelong geek and a veteran of the United States Air Force, both of which are incredibly useful when writing. Her degrees in meteorology and accounting are slightly less applicable to writing but absolutely useful when it comes to supporting her family. In 2023, she took second place in the annual Baen Fantasy Adventure Award Contest with her story “Fall from Grace” and won the Imadjinn Award Best Short Story in 2023 and 2024. She is published by Baen, Chris Kennedy Publishing, Hit World Press, and Three Ravens Publishing, and is best known for her novel of the Griffin Corps, Rise from Ruin , and novels in the Four Horsemen Universe, the Blood & Armor Series, the Salvage Title Universe, and Hit World Valkyries, as well as numerous short stories. Praise for Melissa “. . . Olthoff creates not only a believable and immersive world, but populates it with people whom you can respect, understand, care for, and sometimes want to punch in the face . . .” —Jody Lynn Nye, New York Times best-selling author Praise for Jason “A great combination of story-telling skill and imagination that really hooks you.” —Larry Correia, New York Time best-selling author of Monster Hunters International
At a Glance
5.00 ★ GoodreadsTop TropesPlot devices and story situations that drive the romance. These are the circumstances that throw characters together or create conflict, not how they personally relate.
MoodWhat you felt reading this. Swoony? Gutted? Deliciously unhinged? The emotional fingerprint.
Book Details
Goodreads RatingThe crowd's verdict. Take it with salt, though. Some masterpieces are polarizing.
5.00 ★
Page CountHow long the commitment is.
400 pages
PublishedWhen this hit shelves. Helpful for tracking vibes by era.
2026
Primary GenreWhat type of book this is. Romance? Fantasy? A 400-page therapy session disguised as a thriller?
Sci-fi Romance
PairingWho's falling in love? The gender makeup of your main romance. Helps you find your specific flavor of love story.
M/F
POVWhose head are you in? First person = deep in the feels. Third = watching from above. Dual = emotional whiplash (affectionate).
Dual POV
Romance PacingHow long until they kiss? Slow burn = 300 pages of tension. Insta-love = page 12 and it's already chaos.
Slow Burn
CliffhangerEnding type: HEA = forever happy (you'll cry happy). HFN = happy for now (open to interpretation). Bittersweet = complicated feelings. Know what you're signing up for.
spoiler
AudiobookCan you experience this book while driving? Washing dishes? Working out while emotionally destroyed? Check here.
AvailableCan you experience this book while driving? Washing dishes? Working out while emotionally destroyed? Check here.
Yes
FormatHow fancy is the audio? Standard = one narrator. Full cast = theater kids went off. GraphicAudio = a MoViE iN yOuR mInD.
Unabridged
NarratorThe voice in your ears.
Luis Moreno
TropesPlot devices and story situations that drive the romance. These are the circumstances that throw characters together or create conflict, not how they personally relate.
Mood & Vibe
MoodWhat you felt reading this. Swoony? Gutted? Deliciously unhinged? The emotional fingerprint.
Writing StyleHow the author writes - prose style, dialogue approach, and narrative voice. This is about craft and delivery, not emotional effect.
Story PacingDoes the story sprint or saunter? Fast = you'll miss sleep. Slow = you'll savor every word. Medium = balanced chaos.
medium
Emotional WeightHow much are you gonna cry? Light = fun feels. Moderate = real stakes. Heavy = bring tissues. Devastating = call your therapist.
moderate
Energy RequiredCan you read this on a Tuesday after work, or do you need a full Saturday and three cups of coffee? Low/Medium/High.
medium
VibesOne perfect sentence that captures the essence. Like: 'Fae politics meets forbidden romance with zero chill.'
Characters
FMC ArchetypeWho is she? The female main character's core identity/role. Assassin? Healer? General Badass?
MMC ArchetypeWho is he? The male main character's core identity/role. Your exact flavor of book boyfriend.
Relationship DynamicsThe interpersonal dynamic between the main characters. How do they relate to each other? This is about character energy and connection style, not plot situations.
Spice Details 🌶️
Spice StyleNot just how much spice, but what kind. Emotional intimacy? Explicit but vanilla? Plot-driven heat? Know your flavor.
Getting SteamyGentle kinks. Fun but nothing too crazy. The appetizer, so to speak.
Bringing the HeatFor those who know exactly what they came for. This is where you find your exact brand of chaos. The good stuff.
World & Setting
World TypeWhat kind of world are you stepping into? High fantasy = full secondary world. Urban fantasy = magic in modern cities. Portal = starts here, goes there.
Primary SettingWhere does the story physically take place? Court intrigue = palace. Dark academia = campus. Cozy witch vibes = small town. This is about location, not world rules.
Fantasy CreaturesWhat supernatural beings populate this world? Fae courts, vampire covens, dragon riders, or just regular humans doing their best.
RepresentationIdentity representation in the book. LGBTQ+, race/ethnicity, disability, neurodivergence, body type, age and more.
Reading Context
Emotional PayoffWhat you get for showing up. The catharsis, the growth, the 'I'm a different person now' moment. This is why the hard books are worth it.
Best Time of YearSeasonal mood rings for books. Summer romance reads different than winter gothic.
anytimeWhen & Where to ReadContext matters. Some books are Beach Trip energy, others are 3am Bedtime spiral-reads. Trust.
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