Castle: Heartbreak Hotel / Season: 4 / Episode: 8 (2011)

During the investigation of the murder of an Atlantic City casino owner at an abandoned warehouse, strong leads emerge for the team in both New York and Atlantic City. As Beckett and Capt. Gates work the New York leads together, Castle naturally chooses to join the detectives for the road trip to "America's Playground", hoping to help solve the case while throwing an impromptu bachelor party for Ryan.