The cash disappeared from a hotel bank vault while Robert Plant and co. were playing at Madison Square Garden. No trace of the swag � worth $1.1m today � has ever been found.

"The Drake Hotel is long gone," say screenwriter Jackie May Tolliver and director Gabe Tolliver. "There's no sign of the money. But somebody took it. Was it manager Peter Grant? Road manager Richard Cole? Housekeeping?

"It's a fan movie, for lovers of history, or for folks who just want to know what happened to that money. We need your help to finish the film � we need $35,000 for editing, sound design, music rights, DVD, advertising and film festivals, which ain't cheap."