The defenestration of an impresario's young son was definitely not the best way to end the play's first night party. And the crime scene itself was most unusual, a locked bedroom. No sign of forced entry. No prints or traces of blood. Just a sinister, life-size puppet of Mr Punch lying on the floor ... It's a perfect case for Bryant and May and the Peculiar Crimes Unit but the Home Office wants them off the investigation, however. Delving into the history of London Theatre they uncover a maniacal killer at work - one who must be caught before it's curtains for everyone!