Sipowicz disagrees with Sylvia over their wedding arrangements, for he wants to travel to Maryland for a quick one, whereas Sylvia wants a traditional Greek Orthodox service. Shortly thereafter, Simone and Sipowicz investigate an execution-style murder of three people at a fast food restaurant and the investigation leads them to travel upstate to look for a possible suspect. While there, Simone tests his homing pigeons by releasing them, hoping they will make it back to New York. Meanwhile, Lesniak meets an old high school boyfriend of hers, now a doctor, while investigating a rape case with Martinez, who develops a case of jealousy.

The detectives investigate a strangulation murder that may be tied to one of Diane Russell's cases; Russell consults a doctor when she discovers a lump in her breast; Medavoy and Jones investigate an arson linked to two boys.

Sipowicz, Russell, and Clark attempt to connect the murder of a young woman to two other killings; Medavoy and Jones investigate the shooting death of a mother whose children feared her.

A woman survives the serial killer's attack, and her account prompts the detectives to focus on Carlin, his partner, and a bodyguard; Medavoy and Jones investigate when an off-duty officer kills a man; and McDowell comforts Russell during a biopsy.

When another woman is murdered by the serial killer, the detectives arrest a suspect... and discover the killer's identity; and expecting a baby, Sipowicz and McDowell decide to get married.