Includes deleted scene, discussion questions, an interview with Rory Power and her editor, and an excerpt from the author's Burn Our Bodies Down.

Originally published in hardcover in the United States by Delacorte Press, an imprint of Random House Children's Books, in 2019.

"It started slow. First the teachers died one by one. Then the Tox began to infect the students, turning their bodies strange and foreign. Now, cut off from the rest of the world and left to fend for themselves on their island home, the girls of the Raxter School don't dare wander outside the surrounding fence, to where the Tox has made the woods wild and dangerous. But when Byatt goes missing, Hetty will do anything to find her, even if it means breaking quarantine and braving the horrors that lie beyond. And when she does, Hetty learns that there's more to their story, to their life at Raxter, than she could have ever thought true."--Back cover.