is a YA thriller that continues the story of Cassie Hobbes, a teenager with a natural talent for profiling people, who is part of an elite FBI program for gifted teens known as "The Naturals". After solving a major case in the first book, the team is pulled into a new, dangerous, and personal investigation: a serial killer is actively mimicking the brutal crimes of Daniel Redding, who is Dean's (a member of the team) imprisoned father.