Stephen Alvin Reisberg and his wife Jenny Sun-Reisberg vanished during a planned trip that began August 27, 1990. The couple left Boston to hike in the Tetons, visit San Francisco, then fly to Kauai, Hawaii, and were due back September 9. A professor reported them missing on September 24 after Jenny failed to return as expected.

Their last known contact was with the program director of the Kokee Museum of Natural History, who remembered them studying maps of Mount Waialeale sometime after September 9 and tried to dissuade them from a difficult route. About two weeks after they disappeared, their rental car was found at the Pu O Kila lookout in Kokee State Park with backpacks, tents, and packed suitcases inside, suggesting a short day hike. An extensive two-week search produced almost no confirmed evidence beyond an unverified scarf and a hiker’s report of a woman moaning.

The area is rugged and dangerous; two hikers had been killed by marijuana growers in that region earlier that year. Friends and family have proposed accident, foul play, or a staged disappearance, but nothing definitive has been established and the case remains open. Did anyone on Kauai in September 1990 see the Reisbergs or their car near Kokee State Park?