Five small-town school friends celebrate Halloween with an overnight adventure into the legendary "haunted" Jarvis Mine. Local legend tells of the angry spirits that have occupied the mine since a family was mysteriously murdered exactly 100 years ago. But that doesn't stop these young adrenaline junkies from exploring the unknown - and bringing mini-cameras to capture their every move. Yet once deep into the mine, their best-laid Halloween plans go awry, leaving the adventurers trapped without escape. Are their misfortunes purely accidental or is the legend true and something more lurks in the darkness?