Surprise - S1.E7

Polly and Dennis narrowly avoid being killed by the German plane's bombs. Norman later spies Grainger giving a package to Vivienne Belling. Mary tries to uncover evidence to prove Grainger's a spy. Also, Norman's mother comes to visit him on his birthday. The next day, however, an even bigger surprise awaits the kids in their secret meeting place (the greenhouse at Westbourne Hall).