Photo Flash: First Look - CASTLE's 'The Wild Rover,' Airing 3/25

On CASTLE's upcoming episode, 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 on MONDAY, MARCH 25 (10:02-11:00 p.m., ET), on ABC.

Check out a first look below!

Photos by: ABC/Richard Foreman

Seamus Dever, Benito Martinez

Stana Katic, Nathan Fillion

Stana Katic, Nathan Fillion, Jon Huertas

Seamus Dever

Nathan Fillion, Jon Huertas, Cara Buono, Seamus Dever, JULIANA DEVER

Nathan Fillion, Jon Huertas, Cara Buono, JULIANA DEVER

Nathan Fillion, Jon Huertas, Seamus Dever

Stana Katic

Stana Katic, Nathan Fillion

JEREMY RAY VALDEZ

JEREMY RAY VALDEZ