Lights out, hoods up. Cue screeching as feral youths take on Tommy (Aneurin Barnard), an agoraphobic dad trapped in a rundown housing estate. Ciaran Foy wrote this based on his own trauma after being assaulted, so you can almost forgive the reactionary tone. Still, it's a shame he made the threat tangible. The opening act spins an atmospheric psychological drama out of Tommy's illness – is the gang made up of monsters? Or kids? Then the hoods come down; the enemy's made clear and we're stumbling in horror trope territory. The teens climb the walls. Tommy turns macho in dull, grisly style. Foy's talent lies in suggesting horror, not delivering it.