In 1981, John's son Adam was shopping with his mother when he disappeared from a Florida department store. A nationwide hunt for the 6-year-old followed, but the ending wasn't what anyone had hoped for. Sixteen days after Adam went missing, fishermen discovered his severed head in a canal 120 miles away from the store where he was last seen. "For almost three decades, his case was one of our nation's most well-known and also heartbreaking unsolved mysteries," Oprah says. "Adam's body has never been found, and for 27 years, his case was unsolved."