A wall isn't the only thing dividing the ruined city of Ignis.

In a city split between gleaming towers and irradiated slums, Theopold Kraken fights with the Outsiders?rebels the government calls terrorists. It's a war he believes in. Then he finds Yin.

She's bleeding, feral, and not entirely human. Built in a lab as a weapon, Yin escaped with no memories and a body that's slowly failing. Her Creator made sure she'd never be able to testify about what happened to her. She doesn't understand mercy. She doesn't understand trust. She understands that Kraken is the first person who's ever treated her like she's worth saving?and she doesn't know what to do with that.

As Kraken draws Yin into the Outsiders' world, he discovers that the conspiracy surrounding her reaches into the highest levels of Ignis, and that the people he trusts may be willing to sacrifice her for the cause. Protecting Yin could cost him everything he's fought for. But walking away from her isn't something he knows how to do.

Two broken souls. One chance at freedom. In a world where trust can kill you, choosing each other might be the most dangerous act of all.

★★★★★?Reader's Favorite "An ambitious and spectacularly executed novel... Very highly recommended."

★★★★★?Book Shelfie "Hits that sweet spot between philosophical sci-fi and dystopian thriller."

★★★★?Literary Titan "This is Yin's story of becoming someone, not something."

For Readers Of

Red Rising by Pierce Brown · Murderbot Diaries by Martha Wells · Iron Widow by Xiran Jay Zhao

If you loved Ex Machina, you'll love Yin.

About the Series

Caenogenesis is Book 1 of The Gemini Files, a post-apocalyptic sci-fi dystopian trilogy following Yin Izumi's journey from weapon to person?and everything that comes after.

Book 2, Metempsychosis, is forthcoming.