Felton gets a primary case, in which a family gets robbed and the mother is fatally shot. As the team investigates, the father blames himself for the loss.
Felton's friend kills his ill father in an assisted suicide, and a suspicious Lewis is assigned to the case. Frank and Bayliss investigate the murder of a drug peddler.
Bayliss and Pembleton investigate the murder of a much-loved woman, only to find that she worked at a phone sex company. Meanwhile, a depressed Detective Munch tags along on Bolander's romantic dinner date after being dumped.
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.
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.
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.
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.
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.
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.
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.