When a phantom moose nearly runs Theo's car off an icy Alaskan road, Theo succumbs to curiosity, following the moose's trail to a door hidden amongst the trees. Despite the threat of becoming the latest victim in a string of mysterious disappearances, Theo crosses the threshold. To his horror, the door vanishes, stranding him in a monster-infested alternate reality. Looming adult responsibilities are forgotten as Theo must fight just to survive.

Inside the surreal dimension behind the door, Theo finds allies who hold the encroaching darkness at bay: a sword-wielding man named Archer with a strange case of amnesia, and a shapeshifting dragon named Zephyr. A sinister phenomenon threatens to consume Theo as he grapples with his sense of identity and growing feelings for Archer; the longer he remains in this realm, the more his own memories slip away.

With darkness closing in and his time running out, Theo must unravel the secrets his companions harbor and confront his own inner demons if he hopes to find a way back to the world he knows before all is lost to the shadows.