VIDEO: Sneak Peek - 'Mad Men's Cara Buono Guests on Tonight's CASTLE

On tonight's episode of ABC's CASTLE titled "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. The episode airs tonight, MONDAY, MARCH 25 (10:02-11:00 p.m., ET), on the ABC Television Network. Below, check out the sneak peek from TVGuide.com.

"Castle" stars Nathan Fillion as Richard Castle, Stana Katic as NYPD Detective Kate Beckett, Susan Sullivan as Martha Rodgers, Molly Quinn as Alexis Castle, Penny Johnson Jerald as NYPD Captain Victoria Gates, TAMALA JONES as Medical Examiner Lanie Parish, Jon Huertas as NYPD Detective Javier Esposito, and Seamus Dever as NYPD Detective Kevin Ryan.

Guest Cast: Juliana Dever as Jenny Ryan, Cara Buono as Siobhan O'Doul, Brian Letscher as Liam Finch, Christina Cox as Maggie Finch, Michael Rodrick as Robert "Bobby S" Shannon.

"The Wild Rover" was written by Terence Paul Winter and directed by Rob Hardy.

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