After an all-out battle in Mexico, Jax, Riley, and Evangeline have gone into hiding. There are still rogue Transitioners and evil Kin lords on the hunt for Riley, a descendant of King Arthur, and Evangeline, a powerful wizard with bloodlines to Merlin, in order to gain control over the Eighth Day. So when Finn Ambrose, a mysterious stranger, contacts Jax claiming to be his uncle, Jax's defenses go up especially after Jax learns that he's holding Jax's best friend, Billy, hostage. To rescue Billy and keep Riley and Evangeline out of the fray, Jax sneaks off to New York City on his own. But once there, he discovers a surprising truth: Finn is his uncle and Jax comes from a long line of Dulacs a notoriously corrupt and dangerous Transitioner clan who want Riley dead and Evangeline as their prisoner. And family or not, the Dulacs will stop at nothing to get what they want.