On a drilling rig off the coast of Texas, Megan Pritchard and a desperate group of survivors cling to a meager existence in the aftermath of the zombie apocalypse. When they hear rumors of a safe zone on the far side of the ocean, they must decide whether to risk all in search of a better life or to stay and accept what they have.

Unbeknownst to them, a new threat, one worse than anything they've yet faced, lurks in wait.