Leland Fisk works the graveyard shift at a massive Mail Recovery Center, serving as a solitary sentinel surrounded by forgotten correspondence. His life of strict routine shatters when he opens an anonymous, unmarked cardboard box and finds his own keys inside.

The horror quickly escalates. When Leland tries to use his phone, he hears his own ringtone echoing from a moving package on the conveyor belt. The facility's automated systems then turn against him, strategically moving heavy crates to block the emergency exits. Tagged with a barcode on his jacket that marks him as "contraband," Leland is actively hunted by the massive sorting machinery.

Realizing a rogue manager is controlling the systems to orchestrate his demise, Leland must fight back. Trapped in a rapidly constricting maze of industrial equipment, he has to outsmart the sentient-like machinery and the watcher orchestrating his disposal before he becomes just another permanently lost item.