To avoid financial ruin, the Pringle family's theatre-troupe has left London behind, travelling to the north of England by train. With new audiences to play to, and less competition, they hope to make enough money to pay off their debts back home. But will their plans be foiled by the odious Olio Sleevery? It's time for young actors Rosie and Charlie to save the day - and, with the help of their new friend Edie Boiler, ensure the thunderous success of the company's first performance.