The source provides an extensive account of the Willow Creek serial murders, detailing how a series of disappearances between 2010 and 2022 were finally solved. Central to the case’s resolution was a cryptic letter sent by the killer, "The Architect," to local journalist Clara Thompson, which contained the key phrase, "So much blood hidden in the walls." This confession led investigators to an abandoned factory, the Old Mill, where the remains of the victims were found behind a false wall. Thompson’s independent investigation, focused on the killer's self-proclaimed title, helped identify the perpetrator as Daniel Carver, a former architect who had intimate knowledge of the building’s structure. The episode explores the killer's psychological profile, his arrest, and the profound impact the case had on the grieving community and the field of criminal investigation.

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