Flame-haired Wimbledon girl Joan Harvey could not have chosen a worse time to fall in love with Matt Pearson. With no end in sight to the Second World War, and Joan discovering she is pregnant, a rushed marriage is her only option, despite her family's reservations. Then, on a visit to Matt's family in the East End, a street accident results in Joan going into premature labour. As her baby is born, a bomb plunges the hospital into darkness, before Joan has even had a chance to look at her son... No one is happier than Joan to see the end of the war. Finally she and Matt can begin to behave like a normal family, and bring up their son and two daughters. But then a call from a solicitor brings astonishing news, about the day Joan's son was born, that is set to change Joan's life for ever...