Detectives investigate different homicide cases in inner-city Baltimore. Working for the police department, these detectives are committed to bringing justice to the streets of Baltimore.
When a girl is murdered and left in a dumpster, the unit investigates the case - but a lack of evidence makes things difficult. (S3, ep 1) Also in UHD.
Still investigating the murder of Catherine Goodrich, another victim is found with the same clues and Frank is now the primary on the case. (S3, ep 2)
With another girl found dead with a glove on her hand next to a Catholic Church, Frank questions his faith. (S3, ep 3) Also in UHD.
Kay Howard becomes closer to John Munch when she realises how saddened he is by children being involved in horrific crimes. (S3, ep 4) Also in UHD.
Gee investigates the murder of an old friend and Bayliss's relationship with the police artist turns sour. (S3, ep 5)
The unit investigate the death of their friend and Lewis' partner Steve Crosetti which appears to be a suicide, but Lewis is sure there is more to it. (S3, ep 6) Also in UHD.
Howard decides to go on a sudden vacation to her hometown, but soon she has to investigate a murder of a conservationist. (S3, ep 7) Also in UHD.
It's Christmas time and Lewis gets a case in which the victim's identity is unknown due to heavy burns. (S3, ep 8) Also in UHD.
Bayliss and Frank investigate the murder of a kid who was shot in a bowling alley. Felton gets a clue about his family's whereabouts. (S3, ep 9) Also in UHD.
Lewis and Munch investigate the death of Andrew 'Monk' Whetherly, a member of the Deacons Motorcycle Club. (S3, ep 10) Also in UHD.
Detective Douglas Jones, Russert's former partner, joins Homicide from Narcotics. (S3, ep 11) Also in UHD.
Detectives Howard, Bolander and Felton are shot during an ambush and left in critical condition and Pembleton feels obligated to get justice. (S3, ep 12) Also in UHD.
The Homicide Unit captures Glen Holton only to learn that he wasn't the one who shot Felton, Bolander and Howard. (S3, ep 13) Also in UHD.
The scene of the crime, Apartment 201, is searched and reveals that the occupant, Gordon Pratt, is a gun freak who once tried to be a cop. (S3, ep 14) Also in UHD.
Pembleton and Lewis investigate the random shooting of a woman, meanwhile Bayliss suspects Munch of going vigilante and murdering Gordon Pratt. (S3, ep 15) Also in UHD.
Both Detectives Bolander and Howard return to work on the same day. Kay Howard obsesses over the relocation of her desk while she was out. (S3, ep 16) Also in UHD.
On the eve of his execution, the accused's daughter takes Col Barnfather hostage, demanding a reinvestigation of the case to save her father. (S3, ep 17) Also in UHD.
When Crosetti's caseload is to be distributed among the detectives, Howard's 100% clearance rate leads Giardello to assign her a difficult case. (S3, ep 18) Also in UHD.
When Bayliss' cousin shoots a 'crazed' Turkish young man at his door, Pembleton and Bayliss differ on motive. (S3, ep 19)
Pembleton is oblivious to being relentlessly stalked by The Gas Man, a man he sent to jail for negligence in a gas explosion that killed a whole family. (S3, ep 20)