It was a case that defied expectation at every turn, and with each new development, the stakes never felt higher. In 1981, a 13-year-old girl vanished from her home in Seaside, California, after her step-father physically assaulted her. Her mother claimed for decades afterward that Mary ran away that night. Her siblings believed she was murdered. Uncovering the truth would mean putting the whole family — including Mary herself — under the microscope.
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