Congratulations, you've been hired as the night conductor of the Hollow Line, a train that only runs after midnight and only underground. Follow every rule, especially rule number seven. Rule number one, never board the train before it arrives. If the doors open and no train is there, don't step forward. Something invisible boards first. Rule number two, >> if you hear someone whisper ticket behind you, don't turn around. There is no >> no passenger speaks on the hollow line. >> Rule number three, at car 4, you'll see an empty seat covered in dust. Don't brush it off. Someone is sitting there. They just never left. Rule number four, if the train bell rings twice, close your eyes. Once for a stop, twice for a warning. Whatever walks the aisle after that shouldn't be seen. >> Rule number five. Footsteps will follow you between cars.