1. Nearer My God to Thee
When a beautiful girl is murdered, dragged in a dumpster, the unit investigates the case, but it's difficult without a clue except of a white glove found on the hand of the victim.
2. Fits Like a Glove
Still investigating the murder of Catherine Goodrich, another victim is found with the same clues and Frank is now the primary on the case. Felton is thinking about going back to his wife, Munch and Lewis consider to buy a tavern.
3. Extreme Unction
With another girl found dead with a glove on her hand next to a Catholic Church, Frank questions his faith but then a witness might help the detectives find out the killer's identity.
4. A Model Citizen
Kay Howard becomes closer to John Munch when she realizes how saddened he is by children being involved in horrific crimes. Meanwhile Bayliss falls for a seductive closet-goth, Emma Zoole.
5. Happy to Be Here
Gee investigates the murder of an old friend and Bayliss's relationship with the police artist turns sour.
6. Crosetti
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 than this.
7. The Last of the Watermen
Howard decides to go on a sudden vacation to her hometown, but soon she has to investigate a murder of a conservationist. Meanwhile, Frank has to fill the absence of Howard as the partner of Felton to solve a case.
8. All Through the House
It's Christmas time, and Lewis gets a case in which the victim's identity is unknown due to heavy burns. Munch and Bolander deal with the death of "Santa" but nothing seems to ruin Bolander's Christmas spirit.
9. Every Mother's Son
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.
10. Cradle to Grave
Lewis and Munch investigate the death of Andrew "Monk" Whetherly, a member of the Deacons Motorcycle Club. Whetherly's wife, Bree, leads them to Preacher, the gang's warlord, who says Monk was killed "because he loved his little girl."
11. Partners
Detective Douglas Jones, Russert's former partner, joins Homicide from Narcotics. Later, when Jones' wife Natalie is admitted to the hospital with suspicious injuries, Russert confronts Jones about possible spousal abuse.
12. The City That Bleeds
Detectives Howard, Bolander and Felton are shot during an ambush and left in critical condition. Pembleton feels obligated to get justice, Munch becomes traumatized and shocked, and Giardello faces an investigation of his work.
13. Dead End
The Homicide Unit captures Glen Holton only to learn that he wasn't the one who shot Felton, Bolander and Howard. Meanwhile Russert is forced to investigate Giardello's work to find out if he should be at fault for the ordeal.
14. End Game
Bolander has a relapse. The detectives sound off to the local news about the shooting. Apartment 201 is opened up and the occupant, Gordon Pratt, is a gun freak who once tried to be a cop.
15. Law & Disorder
Pembleton and Lewis investigate the random shooting of a woman, meanwhile Bayliss suspects Munch of going vigilante and murdering Gordon Pratt. Felton tries to get used to being back at work but finds getting around to be difficult.
16. The Old and the Dead
Beau meets Megan's cousin, NBC's Tim Russert. Kay and Stan return to duty, after Stan undergoes a final test, and Kay finds her desk has been moved.
17. In Search of Crimes Past
A 16-year-old murder case must be reopened when the daughter of the convicted killer holds Col. Barnfather hostage. Pembleton and Bayliss investigate an elderly man whose wife died of drowning in the bathtub.
18. Nothing Personal
Crosetti's caseload is distributed among the detectives and Howard's 100% clearance rate may be in jeopardy when she gets his most difficult unsolved case; this is further complicated when Beau misplaces some new evidence.
19. Colors
Tim's cousin shoots a Turkish exchange student and his partnership with Pembleton may be in jeopardy when they both stand on opposite sides of the case. Lewis hires his grandmother to cook at the bar.
20. The Gas Man
A convict is released from prison and begins to get his revenge on Frank by frustrating the investigation he is currently working on and also by terrorizing his wife.