Night, Mother

A game of one-on-one is interrupted by the discovery of a woman covered in blood leaning over the body of another woman who has had a stake driven through her heart. Mac soon realises the woman was sleepwalking and tried to save the victim's life, but the case stalls because she is the closest thing they have to a witness, and she has no memory of the event. Danny and Aiden investigate the brutal murder of a pickpocket whose identity they track down using information on an experimental medical trial. Money found in the victim's underwear leads the two to another pickpocket, but there is no obvious motive for Lenny Cook's death.

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S01E11 - Tri-Borough