Castle

Season 4, Episode 7

Episode Title: Cops & Robbers

Air Date: 2011-10-31

Overview:

A crew of bank robbers disguised as classic television doctors take hostages which include Castle and Martha. But things are complicated by the fact that Beckett's on the outside having her every move scrutinized by a hostage negotiator and Castle's on the inside with information that the hostages are just a distraction for a more ominous plan.