In the heart-stopping conclusion to the Timeless saga, Simon and Elizabeth Cross have successfully reset the timeline but the danger is far from over. The evil Shadow Council, now calling themselves the Continuum, are hellbent on eliminating the ultimate threat to their existence: young Charlotte Cross.
Simon and Elizabeth, along with their friend and fellow time-traveler Jack Wells, must do everything in their power to protect Charlotte or all will be lost for them and for the world for all time.