Danny and Andy catch an assault that looks like it was done by the boys in blue. Jill considers dating her ex-husband.

Jill's son has his first communion, where Andy and Danny spot a surveillance van across the street from the church. A baby is found dead in a dumpster.

Andy is finding Theo a challenge. A man is found dead in a hotel bath-tub, minus a part of his anatomy and some personal effects. A mother brings her son into the house because she thinks he's been stealing.

The squad attends a homicide with seven naked bodies. Jill's ex is arrested.

James passes his sergeant's exam. Jill's ex-husband could be causing problems for Jill.

A woman is run over by a bus, she was already dead when she was tossed from a van. Two Russian boys go missing after their father says he left them with his sister.

Andy and Danny reopen an unsolved murder when the body of a small child is found buried within a wall; Medavoy and Jones deal with the owner of a dog who has a bullet in his nose they need as evidence in their case.

Andy and Danny investigate the robbery of an elderly couple; Medavoy and Jones deal with a wealthy woman with a grudge against her former maid; Danny's informant, J.B., seems headed for disaster.

Danny has an emotional crisis; John Irvin helps in a case involving stolen antique clothing; Jill deals with a young woman with small children who steals because of her unemployed, abusive husband.

Jones uses his charm to help Andy and Danny solve the murder of an elderly couple; Medavoy gets involved with an old friend who is having trouble with the Chinese mafia.

The detectives investigate a multiple homicide at a fast food restaurant; an addict gives his baby daughter to a drug dealer as collateral on an overdue loan; Internal Affairs reopens the Kirkendall case.

Danny wakes up in Diane's bed. Andy and Katie get Theo's test results. A former colleague of Bobby's reaches out to Diane from prison. The team investigate a series of cab-driver shootings.

An female officer is shot following a stationery store robbery and later dies in hospital. Danny tries to keep Diane safe. A new ADA arrives. Katie decides to move back home.