With the Second World War about to begin, emotions are running high, especially for young Greta Peters who lost her mother, brother and sister to illness and now lives with her father, Harry. When Greta comes home to find a stranger lurking in the darkness, is he a burglar or just a hungry, desperate man? When the two meet again Greta discovers his name is Alexander Armstrong and there is a connection between his family and Greta's dead mother, but what exactly was he looking for in Greta's home, and is it something she can help him find?