Trap

Philadelphia firefighter Cooper Adams takes his teenage daughter, Riley, to pop star Lady Raven's concert as a reward for her good grades. There, Cooper notices the unusually high police presence around the concert venue. He learns from a vendor named Jamie that the FBI plans to catch a serial killer known as "the Butcher", having learned he will be in attendance. Cooper is revealed to be the Butcher himself, secretly checking footage on his phone of his latest captive victim, Spencer, in a basement. He steals Jamie's ID card and learns the passphrase that will identify him as an employee, using the card to gain access to a back room and steal a police radio.