In the shadow of the Zagros mountains a US military unit comes under fire from Iraqi forces. The resulting firefight causes an earth tremor where both sides fall into the ruins of a buried Sumerian temple. With all communication severed, our protagonists are trapped and must navigate a way to escape - unaware that something ancient and evil has awakened in the shadows and is hungry for blood.

In this terrifying underworld, ask yourself who your real enemy is. The monsters hiding in the shadows or the other people trapped with you? Will you set aside your rivalries to face a common enemy? Tough decisions will have to be made… and the consequences could be deadly.