Our time-travelling pupils and teachers return to their school as they prepare to enter the Interwar Years. Starting in 1918, their lessons begin with the language of peace, Esperanto. As the pupils grapple with strange new words, the teacher struggles to master the latest teaching resource - a wind-up gramophone. In 1920, the pupils line up for a bizarre school medical, having their lung capacity and even head circumference measured as a sign of their intelligence. The headmaster announces a surprising treat, it's time for the class to take their compulsory nap. There's a mutiny in the classroom as its announced boys will learn science and make a model zeppelin, while the girls tend to dolls and fold nappies. The boys have a surprise in store when they start their P.E lesson in 1937, with a routine inspired by the Hitler Youth. Military training in schools signals an impending war, and so the boys take part in a patriotic march.