The murder of Margie Portman and her daughter, Tisha is the worse Springfield P.D. has seen for a long time. Tisha's best friend, Cheryl has been sexually assaulted and stabbed but she's still alive. Having returned from a Horrorcore concert, Lt. Joe Novelli has to determine if the violent music had anything to do with the murders and assault or if the few suspects he has are the guilty party. It's a twist that even surprises Novelli.