Heart pounding, Ava stepped inside the room 413. The moment, she entered, the air seemed to thicken, pressing down on her chest. She looked around. The furniture was neat, untouched -- yet it felt as if someone had just been there. On the bedside table lay an old book with cracked leather cover. She picked it up, curiosity overtaking her fear. Inside, a single note was tucked neatly between the pages. In faded ink, it read: If you are reading this, it's already too late