Welcome to the strange and perilous world of Katherine Colebrook: FBI special agent, Los Angeles... Trackers Division.

The race to kill it before it kills again has begun.

Katherine and Reese are faced with their most terrifying case yet when a fae who has ventured into black magic starts preying on the children in Los Angeles.

Not surprisingly, Alexandra finds more trouble of her own at school, this time of the human variety. Teenagers don't need to be parasapiens to make life difficult for their classmates. And as if navigating the social politics of high school isn't difficult enough, Alexandra brings a killing to her mother's attention when she has a vision - a vampire on the hunt for a wolf.

Then, Katherine is blindsided by a new case brought to her from someone from her past. Someone who doesn't know her through friendship, but through blood. A cult of vampires is terrorizing the country, determined to let their appetite guide their path, and it's up to the FBI to bring them down.

What will happen when Katherine's past clashes with her present and threatens to disrupt her future?