Jednog maglovitog jutra, Liz Dunn (Thora Birch) se spotakne na putu do škole i poviče za pomoć. Uz pomoć policijske psihologinje, otkrije svoju priču: prije mjesec dana, tri tinejdžera, Mike (Desmond Harrington), Frankie (Keira Knightley) i Geoff (Laurence Fox), pokušali su izbjeći školski izlet u Wales. Školski šmokljan Martin (Daniel Brocklebank) pomogao im je smjestivši ih u stari ratni bunker na tri dana pod uvjetom da im se pridruži njegova prijateljica Liz. Tinejdžeri su se zabavili, ali Martin se nije vratio po njih i oni se nadaju i mole da će ih netko naći...
A fun-filled getaway for four teenagers becomes a season in Hell in this tense British thriller. Liz Dunn (Thora Birch) is a student at an exclusive private school who is head over heels for Mike Steel (Desmond Harrington), a handsome classmate whose father is a well-known American rock star. Liz, however, is self-conscious about her looks and is convinced Mike would rather be with the prettier girls in her class. Liz is also unenthusiastic about an upcoming field trip, in which she and the other students will have to camp out for three days while studying local geography. Liz confesses her infatuation with Mike to Martin Taylor (Daniel Brocklebank), a science-minded geek and longtime friend who happens to be in love with Liz, though she prefers to ignore it. Martin proposes a solution to both of Lizs problems; hes found an underground bunker built during World War II near the school grounds, and he arranges a little party in which Liz and Mike will spend the three days of the field trip in the bunker, with class couple Geoff (Laurence Fox) and Frankie (Keira Knightley) going along, giving Liz a perfect chance to impress Mike with her charm. The students lay in a supply of food, water, and booze to last them for three days, but after 72 hours, they discover theyve been locked in, and theyre not sure if Martin intends to let them out.