Tina Craig longs to escape her violent husband. She works all the hours God sends to save up enough money to leave him, also volunteering in a charity shop to avoid her unhappy home. Whilst going through the pockets of a second-hand suit, she comes across an old letter, the envelope firmly sealed and unfranked. Tina opens the letter and reads it - a decision that will alter the course of her life for ever... Billy Stirling knows he has been a fool, but hopes he can put things right. On 4th September 1939 he sits down to write the letter he hopes will change his future. It does - in more ways than he can ever imagine...