Spirit Lake is unusually deep. No diver has ever managed to find the bottom, though many have tried. When Dr. Amelia Brooks disappears during a deep-water dive, her three daughters travel home to settle her affairs. They find themselves unable to let go of their mother and become drawn into the mysteries of the lake.

A lonely Japanese woman becomes convinced that a satchel of money buried and lost in a fictional film, is in fact, real. With a crudely drawn treasure map and limited preparation, she escapes her structured life in Tokyo and embarks on a foolhardy quest across the tundra of Minnesota in search of her mythical fortune.