To stop her sadistic grandfather, Saul, and his band of time travelers from rewriting history, Kate must race to retrieve the CHRONOS keys before they fall into the Cyrists' hands. If she jumps back in time and pulls the wrong key--one that might tip off the Cyrists to her strategy--her whole plan could come crashing down, jeopardizing the future of millions of innocent people. Kate's only ally is Kiernan, who also carries the time-traveling gene...