A caving expedition goes horribly wrong, as the explorers become trapped and ultimately pursued by a strange breed of predators.
Follows a tough, working-class, petty criminal who morphs into an anti-heroine to be reckoned with in a murky underworld, in the treacherous world of diamond smuggling.
When Royal Air Force pilot Lt. Kate Sinclair is shot down over Afghanistan, she finds refuge in an abandoned underground bunker where deadly man-made biological weapons - half human, half alien - are awakened.