Trench Coat

In 1966 a group of Juniors from Illinois High were brutally attacked and killed over the course of 3 months in about the same way. All were knife wounds and when done the killer left a trench coat at the scene. The killer was never found but police found a house filled with the coats thought to be from the killer. 50 years later a string of murders start up again with a group of Juniors from the same class at Illinois High.