When the police discover drains clogged with rotting flesh and bones, a meek civil servant confesses to the killings. How did they allow this to happen over five years?

With limited resources, Jay and the police continue to dig into Nilsen's memories in an effort to identify and convict him for the murder of every one of his victims.

Reeling from Des's change in plea, Jay and the police throw themselves into proving premeditation. But if they fail, Des could get a light sentence.