Helen Darlene Fuller was 19 when she vanished on Thanksgiving Day, November 24, 1983. Living in Hollywood, Florida, she was visiting her parents in Durham, North Carolina and left their home with an older friend she lived with; they said they were going to her grandmother’s house but never arrived. Days later the rental car they had been using was found abandoned at South of the Border, a rest stop just over the South Carolina line on Interstate 95.

Investigators found no immediate signs of foul play in the vehicle, but a bag of cocaine and a belt buckle bearing the Outlaws motorcycle gang emblem were inside, details that complicated the case. Darlene left the clothing she had packed for the trip at her parents’ home, and her father spent years pursuing leads, hiring a private detective and following tips that took him to Tennessee and Florida without finding her. No missing persons report has been found for her companion Phil Skip Parselli.

What information might help explain why they never reached the grandmother’s house or what happened after the car was abandoned?