Simon, a 16 year-old teenager, has not shown up for class. Blood stains are found in a class-room. Run-away, kidnap, suicide, murder? In a small town in the suburbs of Paris, a group of teenagers discover a body hidden in a forest. A few days later Laetitia, a student from the same class goes missing. A young girl with no dark background or connection to Simon. The next day, Jean-Baptiste, a third student, also disappears. The psychosis begins.