'Castle' Episode 5.18 Photos: A Woman From Ryan's Past Returns in 'The Wild Rover'

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 (guest star Cara Buono, Mad Men). Much to everyone's surprise, Detective Ryan has a complicated history 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, on Castle, Monday, March 25 (10:02-11:00 p.m., ET), on ABC.



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