New York (CNN) — It was Friday the 13th and Joanne Briscoe, who is not by nature a superstitious woman, felt a sense of foreboding as she left for work.
Every weekday, Briscoe would call home at 7:30 a.m. from her clerk’s job at a Philadelphia, Pennsylvania, insurance company to make sure her 16-year-old son, Allen, and his 17-year-old sister, Latanya, were awake and getting ready to go to school.
But on December 13, 1985, the teens didn’t answer when their mother called. She called again at 3:30 p.m., about an hour after school let out. Still there was no answer.
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