Herbert Frank, 52, was last seen in Lee Vining, California on October 30, 1994, while traveling in the western United States with 26-year-old Volker Puschkeit. The pair had arrived in Los Angeles on October 21 and rented a vehicle for their trip. After reportedly winning about $10,000 at a Reno casino, they were seen near Mono Lake on November 1, 1994. Four days later their rental car was found abandoned in a remote area of Mineral County, Nevada, near Lucky Boy Pass.

The car still contained their passports and luggage, but both men were missing. Investigators have treated the disappearances as possibly homicides because of the large sum of money the two had recently won. Despite searches and appeals for information, no further clues have emerged and the case remains unsolved.

Did anyone in the Reno–Mono Lake area around late October and early November 1994 see Herbert Frank or Volker Puschkeit, or remember the rental car near Lucky Boy Pass?