The first summer a camp goes co-ed.

Seven teenagers. Five months. Twenty feet underground. No exit. The gripping story of a handful of high school kids trapped in a wealthy Philadelphia family's backyard bunker.

The members of the Parker family have had their fair share of complications. When matriarch Kate Parker miraculously survives plummeting over a waterfall in a barrel-a feat captured on a video that goes viral-the dysfunctional Par...