Cragen comes under suspicion when his mentor in the department is investigated for laundering drug money.

A bomb at a construction site kills a 12-year-old boy, and the suspects include the bankrupt contractor and a jealous husband.

Briscoe and his new partner, Det. Reynaldo Curtis, investigate the murder of a young girl who disappeared between school and her music lesson, with a blurry film from an ATM machine as their clue.

A headless corpse fished out of the river sends Briscoe and Curtis out to Los Angeles to obtain a blood sample from their chief suspect while McCoy and Ross back in New York try to obtain a court order for the procedure.

During the search for a pedophile who raped a 10-year-old, a snitch offers Briscoe a chance to avenge his daughter's death. Meanwhile, Van Buren learns that her job is in jeopardy; McCoy is ordered to appear before a disciplinary committee because of his conduct in a DUI case; and the increasingly political Schiff worries that the rape case may adversely impact his reelection bid.