Percy Jackson Mortal AU What if twelve teens who don't really get along are forced to stay at school over night alone? What will happen when feelings and relationships are hurt? When secrets are revealed? When the power goes out? When someone dies? But who did it? When your Locked In there's no one in and no one out. Everyone is a suspect. And everyone suspects each other. Out of twelve: One is dead. One is a murder. But who's who?