Clayton Jessup, a deranged serial killer who targets happy families, is on the loose and looking to kill again; the team must race against time to stop him before it's too late; Bex learns who she can and can't trust.

Dr. Ezekiel Malak, a hospital psychiatrist turned serial killer, is prowling for new victims in Chicago; Bex and the team work to find a method to his madness in a desperate bid to get ahead of him until Malak makes a move no one saw coming.