Charlotte Kirk stars in this sci-fi action horror directed and co-written by Neil Marshall. When RAF pilot Lieutenant Kate Sinclair (Kirk) is shot down over Afghanistan, she flees her attackers and finds shelter in an abandoned bunker. However, there are worse things to fear than enemy soldiers as something terrifying is lurking inside the bunker. Sinclair escapes to a nearby military base but no one there believes her when she explains what she saw. Soon, though, they will all know the truth...