In the summer of 1974, 11-year-old John Wilson does a cannonball into the local swimming pool in Prairie Village, Kansas. He lands on his sister Lizabeth, 13, who starts running home to tell Mom and Dad what John has done. John also races home, trying to beat Lizabeth to the house. He takes a lead on his sister, passes the local high school and continues homeward. John wins the race, but by 10 p.m., Lizabeth is still a no-show. Mr. and Mrs. Wilson become concerned and call 9-1-1 to file a missing persons report. Police canvas the neighborhood, but still no sign of Lizabeth. When police go to the nearby high school, they discover that the only person working at the school around the time of Lizabeth's disappearance was a janitor named John Henry Horton. After talking with the other custodians, police learn that Horton clocked out at 8 p.m. and didn't clock back in until much later than normal. When Horton returned to the school, he claimed car trouble and had scratches on his body, which he claimed he got from working on his car. Police are suspicious of Horton and pay him a visit. When they pop the trunk of his car, they find a bottle of chloroform and a butcher knife. Horton says he stole the chloroform to get high and the knife was a present for his wife. Detectives don't buy his story, and the FBI gets involved in the investigation. Investigators then talk with Beth Reichmeier, 15, who encountered Horton the same day Lizabeth went missing.