A police series set in the 15th Precinct in New York City. Detective Bobby Simone is a loner whose soft-spoken demeanor belies his complex personality. Simone's partner Detective Andy Sipowicz is a recovering alcoholic who is apprehensive about his impending marriage to Assistant District Attorney Sylvia Costas. Lieutenant Arthur Fancy is the no-nonsense yet compassionate head of the 15th Precinct, which also includes James Martinez, a young detective whose lack of experience is more than compensated by his street smarts; hardworking Detective Greg Medavoy, who is committed to reviving his failing marriage; Donna Abandando, the precinct's administrative assistant who is recovering from her broken romance with Detective Medavoy; and Detective Adrienne Lesniak, who overcame a problematic emotional past and is proving her mettle to the squad. The newest member of the 15th, Detective Diane Russell, is struggling with a drinking problem while maintaining a personal relationship with Bobby Simone.