Catarina Agatta is a hacker. She can cripple mainframes and crash though firewalls, but that’s not what makes her special. In Cat’s world, people are implanted with technology to recode their DNA, allowing them to change their bodies in any way they want. And Cat happens to be a gene-hacking genius.

That’s good news, since the human race is at the brink of extinction from a horrifying virus that detonates its victims into mist. Cat will need to team up with a enemy soldier and use her hacking skills to release a genetically-encoded cure. But in a world where nature itself can be rewritten, how much can she even trust herself?

Winner of the Oregon Spirit Book Award! Shortlisted for the Oregon Book Award, the Waterstones Children’s Book Prize, an Aurealis Award, and the Readings Young Adult Book Prize! A Junior Library Guild Selection!

“I was thrilled; I was shocked. I want to know what happens next.” – NPR Books

“Swift, intense action sequences… stunning twists and turns” – BCCB (Starred Review)

This Mortal Coil redefines “unputdownable.” A thrilling, exhilarating read that’s crackling with intelligence. Compelling characters and incredible twists come together perfectly—I loved this book. This is brilliant science fiction.’ – Amie Kaufman, New York Times bestselling author of Illuminae


The nightmare of the outbreak is finally over, but Cat’s fight has only just begun. Exhausted, wounded, and reeling from revelations that have shaken her to her core, Cat is at a breaking point. When news arrives that the Hydra virus might not be as dead as she’d thought, Cat is pushed into an uneasy alliance with Cartaxus to fix the vaccine.

But when she’s confronted with lies and betrayals, Cat is forced to question everything she knows and everyone she trusts. And while her enemy is always two steps ahead, the biggest threat to Cat may be the secrets buried in her own mind. 


Cat’s hacking skills weren’t enough to keep her from losing everything—her identity, her past, and now her freedom. She’s trapped and alone, but she’s survived this long, and she’s not giving up without a fight.

Though the outbreak has been contained, a new threat has emerged—one that’s taken the world to the brink of a devastating war. With genetic technology that promises not just a cure for the plague, but a way to prevent death itself, both sides will stop at nothing to seize control of humanity’s future.

Facing her smartest, most devastating enemy yet, Cat must race against the clock to protect her friends and save the lives of millions on the planet’s surface. No matter the outcome, humanity will never be the same.

And this time, Cat can’t afford to let anything, or anyone, stand in her way.


A FREE short story!

Jun Bei, Cole, Anna, Leoben, Ziana. Five children with extraordinary potential.

They don’t get many visitors at the remote laboratory where they live under the eye of legendary geneticist, Lachlan Agatta. The man and woman who arrive are nothing like the others.

They’re from Cartaxus and offer the children something rare and unfathomable: escape.

But freedom means different things to the five children. For one of them, getting want they want may mean betraying everyone else.

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