Four teenagers at a British private school secretly uncover and explore the depths of a sealed underground hole created decades ago as a possible bomb shelter.
Thora Birch
as Liz Dunn
Desmond Harrington
as Mike Steel
Keira Knightley
as Frances 'Frankie' Almond Smith
Laurence Fox
as Geoff Bingham
Embeth Davidtz
as Dr. Philippa Horwood
Steven Waddington
as DCS Tom Howard
Emma Griffiths Malin
as Daisy
Kelly Hunter
as DI Chapman
Daniel Brocklebank
as Martyn Taylor
Jemma Powell
as Minnie (as Gemma Powell)
Gemma Craven
as Mrs. Dunn
Anastasia Hille
as Gillian
