Blue Bloods – 13×21 – ‘Forgive Us Our Trespasses’ (airing May 19th) – Season Finale – Synopsis

“Forgive Us Our Trespasses” – Danny (Donny Wahlberg) and Baez (Marissa Ramirez) team up with Danny’s old partner, Jackie Curatola (Jennifer Esposito), to find a copycat killer emulating a criminal’s murders from a previous case; Frank (Tom Selleck) and Mayor Chase (Dylan Walsh) battle over how best to handle the city’s rising homeless population; and Jamie (Will Estes), Eddie (Vanessa Ray) and Erin (Bridget Moynahan team up to build evidence against a man previously released, but once again committing criminal assault.

Peter Hermann will be guest star in this episode.