Alex Donovan, having faced the demons of her past, is ready to move on to focusing on her career at the FBI's elite Behavioral Analysis Unit (BAU). That's when Jon Davis, renowned profiler and BAU co-founder, is found dead in his hotel room. The FBI is called in to work on the strangest case they've ever faced. How can you track down a killer who murders his victims without touching them?
Once it's clear the killer is targeting agents in Alex's unit, they are ordered into lockdown, sheltered in the dorms at Quantico. Alex stays with a controversial agent, Kaely Quinn, who just returned from being dismissed three years earlier. As they work together, Alex trusts in Kaely as the role model she's never had, despite being warned away.
Alex starts to question who she wants to become as things get personal, with the brilliant killer striking close to home. Alex will do anything to find the killer, even if it involves risking her own life.