A man suspected of the cold case murder of his wife and son hatches a new plot to kill his mother and father; and detectives solve the 20-year-old murder of a teenager by tricking her killer into licking an envelope, then extracting DNA from the saliva.

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In November of 1986, 25-year-old Josephina Rivera's life comes to a devastating halt when she's kidnapped by 43-year-old Gary Heidnik. Over the next four months, Josephina lives shackled in a basement while her captor abducts four more women to hold hostage in his "house of horrors." Josephina recounts a gripping tale of endurance and the shrewd calculations that helped her devise a plan of escape.

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Three-year-old Vanessa Bennett becomes the lone survivor of her family’s brutal massacre in early 1984. Investigators at the time suspect that a serial killer is at large, but decades later the suspect pool narrows down to just one man.

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