After Will and Mr. Clarke discover a mysterious map Bob left in a box of old nerdy memorabilia, Will rallies his girlfriend-obsessed crew to investigate - but with a blizzard coming, they re afraid to follow. When Mike, Dustin and Lucas learn that Will took off into the freezing wilds alone they rush to stop him. When they discover there may be more to this adventure than a fake treasure map, it''s too late to turn back. They have no choice but to follow the clues further into an abandoned mine shaft full of booby traps and mystery.