The Closer premiered on June 13, 2005. Each season is organized around a central theme, which drives both the criminal plot and Brenda's personal storyline. The crime story expands on an element of the theme, and often parallels or mirrors events in Brenda's personal life.
The series concluded with its seventh season. It contained 21 episodes, the final six of which transitioned the show into the spin-off series, Major Crimes, with Mary McDonnell heading the cast as Captain Sharon Raydor.
Season 1 opens with the LAPD's new Priority Murder Squad (PMS), soon renamed the Priority Homicide Division (PHD), under the direction of Deputy Chief Brenda Leigh Johnson investigating the murder of a technological genius. Brenda has recently joined LAPD after a long career in law enforcement, including with the Atlanta and Washington, D.C., Police Departments. We soon learn Brenda is originally from Atlanta, Georgia, was CIA-trained, and was recruited by her former married lover, Assistant Chief Will Pope. Brenda is resented as an outsider by much of the LAPD and seen as an adversary by Robbery-Homicide's Captain Taylor, who initially persuades her squad to request transfers en masse in an unsuccessful effort to force Brenda's resignation. Brenda soon wins over her assistant, Sgt. David Gabriel, and the grudging admiration of the team when she shows them why she is called a closer; but her battle is far from over. As the season progresses, we see Brenda struggle to establish her authority and earn the respect of her squad, despite the efforts of Taylor and Detective Lt. Andy Flynn to both undermine her authority and hamper her investigations. Slowly, one-by-one, Brenda wins over her team; and, by season's end, she has earned the loyalty of them all, even the hard-boiled Det. Flynn, as they stand united against Capt. Taylor's final attempt to remove Brenda from the squad.
According to James Duff, the theme for Season 1 is a woman alone largely in a man's world but also in a new city. Brenda struggles to be taken seriously as leader of the PHD while establishing a new life in Los Angeles.