
It portrays the detective work of a homicide department in Baltimore; Detective John Munch, Lt. Al Giardello and Detective Meldrick Lewis deal with murder cases.

During questioning about Judge Gibbons' death, Junior Bunk (Mekhi Phifer) sprays the squad room with gunfire, injuring officers.

The squad prepares to bring down the Mahoney clan at all costs; wounded Bayliss fights for his life; Kellerman's day of reckoning arrives.

Murders in Little Italy involve Giardello's family; the unit regroups with two new detectives, Rene Sheppard (Michael Michele) and Mike Giardello (Giancarlo Esposito).

Racial tensions mount between Ballard and Pembleton, who refuses to question Felix Wilson; Munch and Kellerman probe a murder at Camden Yards.