When a man is found dead in an industrial cake mixer, Castle and Beckett trace the murder to an Irish gang in Staten Island and a beautiful bar owner named Siobhan O’Doul (Cara Buono). Much to everyone’s surprise, Detective Ryan has a complicated his... (more)tory with Siobhan and the Staten Island crime family from his days working undercover in narcotics. When the case hits a dead end, Ryan must go back undercover to expose the killer, complicating his relationship with his wife.

Benito Martinez, Brian Letscher, Cara Buono, Christina Cox, Jeremy Ray Valdez, Juliana Dever, Michael Rodrick