Sophie battles the rebelsand recovers dark memories from her pastin 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 workingwiththem. And as they settle into their new lives, they uncover secrets bigger than anything they'd ...