The Cyrists are swiftly moving into position to begin the Culling, and Kate's options are dwindling. With each jump to the past or the future, Kate may trigger a new timeline shift. Worse, the loyalties of those around her--including the allegiances of Kiernan and the Fifth Column, the shadowy group working with Kate--are increasingly unclear. Kate will risk everything, including her life, to prevent the future her grandfather and the Cyrists...