Sophie battles the rebels—and recovers dark memories from her past—in this jaw-dropping fourth book in the bestselling Keeper of the Lost Cities series.
Sophie Foster is on the run—but at least she’s not alone.
Her closest friends from the Lost Cities have gone with her to join the Black Swan. They still have doubts about the shadowy organization, but the only way to find answers is to start working with them. And as they settle into their new lives, they uncover secrets bigger than anything they’d imagined.
But their enemies are far from done and unleash a terrifying plague that threatens the safety of an entire species. Sophie and her friends fight with everything they have—with new allies joining them—but every choice has consequences. And trusting the wrong person could prove deadly.
In this game-changing fourth book in the Keeper of the Lost Cities series, Sophie must question everything to find a truth that will either save her world or shatter it.

Shannon Messenger graduated from the USC School of Cinematic Arts where she learned among other things that she liked watching movies much better than making them. She's studied art, screenwriting and television production, but realized her real passion was writing for kids and teens. She's the NYT and USA Today bestselling author of the award-winning middle grade series, Keeper Of the Lost Cities, as well as the SKY FALL series for young adults. Her books have been featured on multiple state reading lists, published in numerous countries and translated into many languages. She lives in Southern California with her husband and an embarrassing number of cats.