The tower appeared overnight, but it wants to keep you forever. Thursday night, it was a dirt lot. Friday morning, it was a 60-story skyscraper. A tech billionaire wants the building’s secrets for herself. She hires a team to reverse-engineer the overnight construction. But she knows more than she’s letting on. A curious 9-year-old decides there’s treasure inside, and goes exploring. His terrified dad chases close behind. Inside, the facade of an empty office building is quickly shattered. Ghostly figures stalk the explorers. The walls themselves are hungry. And something is waiting on the top floor.