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Holden and Bill return to a perplexing case in Pennsylvania where a set of clues leading in multiple directions leaves no shortage of suspects.
Bill and Holden consult with Dr. Wendy Carr to begin classifying their subjects. They receive surprising news.
Wendy considers an offer. Holden and Bill struggle to communicate the meaning of their findings to the judicial system in the baffling Altoona case.
In the late 1970s two FBI agents expand criminal science by delving into the psychology of murder and getting uneasily close to all-too-real monsters.