A resourceful identity thief does not return from her prison leave. She has served a sentence for using multiple identities to steal money from her victims. All her previous crimes have the same characteristics; she has only stolen from people who seem to deserve it. Until now. FAST tries to figure out the Chameleon's motive through her teenage son. In the middle of it all, Karita struggles to get along with her new team member Tommi, who replaces Niklas' vacant spot on the team.