The episode details the 50-year-old unsolved murder of Ruth Marie Terry, nicknamed the "Lady of the Dunes," whose body was found on a Cape Cod beach. A theory emerged suggesting Terry might have been an extra in the movie Jaws, filmed nearby, but this was ultimately unsubstantiated. Recently, investigators identified her killer as her husband, Guy Muldavin, who died in 2002. Muldavin was a suspect in other violent crimes, and his book contained a disturbing "recipe" with eerie parallels to Terry's murder. The case is now officially closed.