It is September 1940, Maggie and her young siblings, Grace and Billy, are living in the East End of London with their mother. Their father has been killed at Dunkirk and their mother goes into hospital to have her fourth child, leaving the children with a neighbour. In one of the worst bombing raids of the war their home is destroyed and the neighbour is killed. Bewildered and frightened, the children wander the streets until they are taken in by some nuns. But their problems are not over; no-one can trace their mother and labelled as orphans, they are sent as child migrants to Australia.