In Castle Season 4, Episode 8: "Heartbreak Hotel," Captain Gates sends the "boys" off to Atlantic City to investigate the murder of a notorious casino boss named Sam Siegel — and by "boys," she means Ryan, Esposito, and Castle. This can only mean one thing — impromptu bachelor party! Too bad Beckett has to miss out on all the fun.
Original Air Date: Monday, Nov. 7, 2011 at 10 p.m. ET on ABC