Travis Bell and Emma Lewis reunite to help the FBI capture a serial killer in Pittsburgh, and they must again turn to a notorious teenage sociopath and his twin sister for help finding the murderer. 1982. Junior FBI consultant Emma Lewis rejected the offer to attend Quantico; US Marshal candidate Travis Bell stayed to train within a new unit of the FBI Behavioral Science division. But the unit’s latest case is feeling eerily familiar and Kristin Gutmunsson— sociopath Simon Gutmunsson's eccentric twin— reaches out to Travis. When Travis and Kristin turn up evidence that points back to Daniel Huxton, the serial killer that Emma had escaped, things become more complicated. Emma turns to Simon for help-- but he is keeping secrets that could impact their investigation. -- adapted from jacket