Conor Devlin has plans of his own when he plots revenge and returns to his home country, Ireland; meanwhile, the team unknowingly finds themselves as a pawn in his plans.

A prominent charity executive is murdered and claims of stalking and blackmail surface during the investigation.

Briscoe and Green discover a murdered businessman may have been the target of a well-known criminal , but the investigation stumbles when the FBI acts as the suspect’s alibi.