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A gas leak at homicide headquarters forces the detectives to temporarily pitch camp at an old bank building, where several bad moods are quickly exacerbated. The many story developments this evening include the negative effect that Howard's (Melissa Leo) promotion has on her colleagues, and Giardello's (Yaphet Kotto) inadvertent dismissal of a key piece of evidence in the murder of an elderly woman. Meanwhile, Pembleton (Andre Braugher) continues to fret over his wife's pregnancy.