The Cyrists are swiftly getting into position to begin the Culling, and Kate’s options are dwindling. With each jump to the past or the near future, Kate may cause a new timeline shift. Worse, the loyalties of these around her—including the allegiances of Kiernan and the Fifth Column, the shadowy group dealing with Kate—are more and more unclear.

Kate will risk everything, including her life, to prevent the near future her grandfather and the Cyrists have planned. But, when period runs out, it may take an even bigger sacrifice to safeguard the people she loves.