Zenobia July, an excellent coder and hacker, investigates a mystery while wrestling with the challenges of a new school, a new family, and presenting her true gender for the first time.

"Cat is desperate to find a way to stop Cartaxus and the plague, but to do so, she'll have to face her most devastating enemy yet"--

"In a world where people are implanted with technology to recode their DNA, gene-hacking genius Cat must decrypt her late father's message concealing a vaccine to a horrifying plague"--

London. Girls are disappearing. They've all got one thing in common; they just don't know it yet . Sixteen-year-old Lily was meant to be next, but she's saved by a stranger: a half-human boy with gold-flecked eyes. Regan is from an unseen world hidden within our own, where legendary creatures hide in plain sight. But now both worlds are under threat, and Lily and Regan must race to find the girls, and save their divided city.