The Unfinished.

While trying to finish his own novel, a mildly successful genre writer discovers old sci-fi manuscript pages in his building’s unfinished foundation. As he tries to pass off these 50-year-old pages as his own, he realizes the otherwordly story they tell might be more fact than fiction, and his quest for more pages sends him down a rabbit hole of portals, distant worlds, and a mysterious terror he might have accidentally unleashed.