When Ella Longfield overhears two young men chatting up teenage girls on a train, she dismisses it—until she realizes they’ve just been released from prison. Her instincts scream to intervene, but hesitation stops her. The next day, one of the girls, Anna Ballard, is missing.
A year later, Anna has yet to be found, and Ella can’t shake the guilt of her inaction. But guilt turns to fear when she begins receiving anonymous threats. Someone wants her silence, and they’re willing to intimidate her to ensure it.
As an anniversary appeal uncovers hidden truths about Anna’s friends and family, Ella realizes that the danger may be closer than she ever imagined. Someone knows the truth about Anna—but will Ella survive long enough to uncover it?