When night falls in Giger, Texas, shadows gather, as they always do in dim corners and other areas bereft of light. But this time they consolidate and attack any who tread too close. Michael Warren, a 24-year-old resident of Giger, finds himself at the epicenter of this horror and is stunned by the losses suffered overnight. Then the sun sets, and the shadows again coalesce, growing more aggressive, the darkness eviscerating anyone it touches.
His only weapon light, Michael struggles to survive and searches frantically for his girlfriend, aiding friends along the way. When Hurricane Daniel roars ashore, wind gusts shred trees and tear down power lines, plunging all of Southeastern Texas into blackness that only feeds and strengthens the encroaching darkness. Rising floodwater provides easy thoroughfares from which the darkness can strike as Michael and his friends contend with the elements, clash with criminals, and battle their way to his residence, where they will stand against the darkness and fight to survive.