Fontana and Green investigate when the body of a young mother who had recently cleaned up her life is found in her apartment, with her five-day-old infant son Nicholas missing. Detectives soon track down Arlene Tarrington and ascertain that the infant she is claiming is hers is really baby Nicholas, but after her lawyers make a claim of post-partum psychosis and another man comes forward claiming to be the child's father, McCoy and Borgia are forced to decide which of the two they would rather lock up for the crime.

The deaths of three women with the same name lead Fontana and Green to the nine-year-old conviction of Leland Barnes, who had shot and killed his wife in an office full of people. With two of the three witnesses against him dead and Jack McCoy on the hit list, the detectives struggle to determine how Barnes, who has been in prison the entire time, got someone on the outside to kill the only people who could keep him in jail. The investigation leads them to Leland's two sons, with surprising results.