herlock identifies new murders as the modus operandi of Wade Crewes, the serial killer whose arrest made Captain Thomas Gregson's NYPD career. Their friendship is strained by necessary questions of whether it's a copycat, a former accomplice, or even the real serial killer. Worse yet, what if Crewes' initial conviction rested on a trumped-up investigation, notably by Gregson's partner at the time.

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