In the first half of this two-part episode, former FBI agent and criminal profiler Candice DeLong digs into the case of Susan Polk. When she was just 15, a troubled and lonely Susan sought the help of a psychologist named Dr. Felix Polk. Instead, she wound up marrying her therapist, and eventually, killing him. In part one, we learn about the history that drew Susan to her future husband, and what set them both on the road to disaster.

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