A family of criminals has the detectives running all over the city until Walsh and Shraeger discover their motives and negotiate a stop to all the crime. Brown has Shraeger investigate Walsh's past because her former partner turned out to be a dirty cop. Meanwhile, Cole's former partner in crime returns, making it even more difficult for Cole to continue to hide his criminal past.

Banks and Delahoy investigate a store selling murder weapons and instructions on how to get rid of the body. Nixon asks Casey to help get a client's son out of trouble on a bogus charge.

When Beaumont is in a pawn shop to get some cash the shop is robbed by a man and a woman. The woman is later the target of Shraeger and Walsh's investigation when she robs a bridal store with a different man.

Beaumont is struck when Lutz pulls a gun at Walsh's diner. While investigating, Walsh and Schraeger uncover Lutz and Cole's past connection. Elsewhere, Banks and Delahoy get help from a clairvoyant passenger when they investigate a rash of bus robberies.

When a drug store owner is shot while running down the street naked, Walsh and Shraeger investigate. Information from the boyfriend of the victim's daughter leads the detectives to a loan shark that the victim had an argument with a few nights earlier. After a series of tapes from an apology line service turn up missing Beaumont and Cole look into the theft. Meanwhile Delahoy convinces the medical examiner to give him an MRI, and he receives some unexpected news.