On the video, the shadow leaned down, whispering into the ear of the Elias on camera. In the present, Elias felt a cold puff of air hit his neck.

He’d spent the last year documenting the "glitch"—a series of unexplainable digital artifacts that appeared whenever he called his brother, Leo, who was stationed at a remote research outpost in the Arctic. Parts 1 and 2 had been nothing but static and audio lag. But Part 3 was different.

Elias double-clicked. The extraction bar crawled across the screen with agonizing slowness. 98%... 99%... 100%.

The file sat on Elias’s desktop, a stark white icon labeled .