Returning from an anti-war demo, Gary (Danny Dyer – Severance) and four friends stop briefly in the countryside. Breaking from the group, Derek (Jimi Mistry – RocknRolla) and Saffron (Lois Winstone – Beyond the Rave) find a metal hatch in the middle of the forest, and decide to explore inside.

Searching for their missing friends, Gary, Pru (Emily Beecham – 28 Weeks Later) and Sarah (Kierston Wareing – Fish Tank) are forced to follow, but as the hatch locks behind them all, the shadows that lurk in the darkness force the whole group to run for their lives...