Rosie is in trouble at school again, just because she struggles with reading. When she picks up an old watch in an antique shop, it transports her to a World War I Red Cross hospital. As a nurse Rosie listens to the men’s’ stories and meets Edith Cavell - who helps soldiers to escape from the Germans. When Rosie learns of Edith Cavell's arrest, she has to make a tricky decision.