Half past five on a Friday evening, and a schools electronic door-locking system shuts down for the weekend with four teachers still in the staff room. Claustrophobia sets in. Ties, jackets and the ceremonies of the school day are shed, giving way to messy power plays, grievances and the desire to behave badly. This deliciously disobedient comic drama asks where the boundaries of professionalism lie, why working with children is so terrifying and how much pressure it takes to reveal the petty, paranoid, impulsive teenagers inside even the most polished individuals.