Maggie and OA lead the search for an abducted former biological weapons chemist.

When an illegal arms broker turned informant is assassinated, OA assumes his identity and goes undercover to stop the sale of dangerous weapons, with help from Maggie and their former FBI instructor, Rowan Quinn.

Maggie and OA are on a mission to find a couple who are behind a spree of violent armed robberies that resulted in the death of an off-duty police officer.

A serial bomber appears to be targeting Wall Street’s elite. Maggie and OA search for a suspect who seems dead-set on revenge, while Dana deals with Spencer Briggs, a cocky profiler brought in to consult on the case.