A series of murders resembling those by George Marlow, who was investigated in the original Prime Suspect, has encouraged Tennison's subordinates to reopen the case, given that Marlow was still in prison when the new crimes took place. Tennison objects, as she is sure Marlow is guilty, and suspects a copycat, but is overruled by her superiors and removed from the case. She is vindicated after suspicion eventually falls onto someone who became friendly with Marlow in prison.