Room 307 was never supposed to matter. It was just another hotel room. Another guest. Another routine shift. Until the night the knocking started. When Emma Carter begins working late shifts at the old Regency Hotel, she notices something strange about Room 307. The guest inside rarely leaves. The security cameras glitch near the door. And hotel records show the man staying there died two years ago. But that’s impossible. As Emma investigates, she discovers hidden maintenance shafts behind the walls — and secrets someone tried desperately to bury. A powerful hotel owner with too many answers. A man officially declared dead… but still breathing. And a missing person case connected to Emma’s own forgotten past. The deeper she digs, the more her memories begin to crack. Because three years ago, Emma stayed in Room 307. And someone never checked out. Now the walls are knocking again. And this time, they aren’t asking to be opened. They’re demanding the truth.