It's 1997 and friends Richard and Steve are climbing to the peak of Mount Cook, the tallest mountain in New Zealand. They're carrying 40 kilos of climbing gear and food. But when the climb takes a dangerous turn, much is lost.

Then, almost 25 years later, a backpack turns up on Mount Cook. Inside, there's a camera with the film intact, memories long-buried make their way back to the surface once more.