The double murder of a wealthy man and his daughter leads the detectives to the wife and stepmother of the deceased. However, Canada's objection to the death penalty hampers McCoy and Carmichael in seeking crucial evidence for obtaining a conviction.

Briscoe and Curtis reopen a case that was closed in the 1960s when a vehicle is dredged from the Hudson River containing the remains of a murdered man who was involved in a fight for civil rights.