Nature and attraction collide in a whirlwind of danger.

The last backpacking group of the season is hiking Tempest, and Dr. Charlie Reynolds is determined to get them safely up the trail and back before the mountain displays the type of stormy weather it was named for. But when the mysterious Jake Nelson and his young charge join the group, the clouds aren't the only thing rumbling on Dr. Reynold's radar, and getting off the mountain alive will be far more difficult than any of them could have prepared for.