In the heart of a Dallas summer, a menacing figure descends onto the concourse of the Mellows Subway Station, dragging a veil of darkness behind him. Escaping beyond the veil proves deadly: a woman loses her life upon crossing, while another loses a hand. The station is sealed off from the world—a private prison made of shadow and concrete. And there, shrouded by the gloom, the malevolent Mr. Wicker lurks, a spectral sentry whom none shall pass.

No one dares to cross beyond the veil, and no one knows if they'll ever escape.

Warren Dodd, an ex-con hoping to be reunited with his family after seven years behind bars, finds himself trapped in the company of a cluster of equally unlucky citizens—an insurance salesman with a chip on his shoulder, a duplicitous attorney, a busker in mental anguish, Warren's wife and child, and a Chinese national running from her past. And nobody is entirely who they seem ...

The group faces a grim choice: decipher the meaning behind Mr. Wicker's presence, or forfeit their lives to the dark.

And with the veil drawing ever closer, time is running out ...