Crosetti focuses his investigation into the shooting of Officer Thormann on one suspect, while Lewis continues to investigate. Meanwhile, Pembleton and Bayliss pursue different leads in the murder case of eleven-year-old Adena Watson.

Howard and Felton are in court over the Pony Johnson case, Crosetti and Lewis go head to head with the Secret Service and Bolander and Munch argue over drug legalization. Meanwhile, Pembleton gets an unexpected job offer.

When the winner of the city's Good Samaritan Award is murdered, Gee and his staff are called to help the new female night shift commander. Pembleton is at odds with the detective he shares a desk with. Beau and his wife separate and Kay gets caught in the middle. Meldrick and Munch have plans to buy a bar and try to persuade Bolander to also become a partner. Bayliss agrees to become a ""silent"" partner. In passing, Crosetti is said to be in Atlantic City on a ""shots, slots and sluts"" dream vacation.

Bolander, Munch, Howard and Felton all meet to serve a warrant, but Bolander, Howard and Felton are shot in an ambush. Pembleton becomes the primary in the investigation and is partnered with a detective who specializes in the psychology of their prime suspect: a pedophile. Stan's ex-partner Mitch Drummond offers his help. Kay's father and Beau's wife and the kids come to the hospital. A clerical error is discovered to be the cause of why the detectives went to the door marked 201, instead of 210.

The detectives continue chasing their only lead, the child molester. Munch is teamed with Stan's old partner. Beau has no feeling in his foot, but feels guilt about Kay's condition. Stan's ex-wife arrives in town, but has a hard time going to see him at the hospital. Barnfather and Granger want Russert to review Gee and see if he was negligent in his duties regarding the paperwork that led to the shooting. The pedophile is located and it is discovered he was responsible for the strangulation of a young boy, but not the shooting of the three detectives.

The squad returns to the station. The FBI joins with the detectives to stop a ""thrill killer"" who's working his way north on I-95. Gee tries to reconcile with his daughter. The killer smells a rat at a roadblock so he bails out of his pickup. Everyone mobilizes to find him and when they do, the suspect in custody, while identical to the killer, claims he is innocent.

Continuing the investigation in New York City, Egan's wife is questioned by Frank and Tim. Just a few hours later, Egan's wife is killed and Egan's son is seen running. Kendall is taken into protective custody until he gives up the suspect's name. Lennie Briscoe and Rey Curtis come to Baltimore. The suspect tried to escape in a seaplane but is caught. This crossover started on Law and Order S06E13 Charm City (I).

Lewis and Kellerman investigate a series of homicides that put them into the middle of a drug war. Kellerman suspects that Lewis is seeing someone, but he doesn't ""kiss and tell."" As the red piles up on the board Gee gets edgy. Kellerman seeks comfort from the godmother of the daughter of the victim's family. Kellerman and ""Drak"" have a confrontation. At a ""Peace on our Street"" demonstration, the current drug war is ended.

Brittany's stalker in Baltimore is interviewed and says that he saw her being attacked by someone. When going to question the parents, the detectives discover that the Janaways have returned to Baltimore, so they make the trip to Charm City. They get the father in the box and he demands that they prove he did it. The attorneys fight over jurisdiction but the judge rules in favor of Baltimore and the two teams of prosecutors must work together.

This crossover starts on Law and Order S08E06 Baby, It's You (I).