In a remote national park Danielle St. Claire, a solo park ranger on Tower Duty in the back country, is drinking heavily. Danni's depressed because her best friend was killed in a drunk driving accident. What's the best way to drown out the memories of killing your best friend by being an idiot and getting behind the wheel while sauced? Drinking more booze by yourself right? I didn't think so, but Danni sure did.