Coronation Day, 1953.

Molly Heywood slips away from the celebrations and makes a shocking discovery: her friend Cassie is dead and her six-year-old daughter Petal has vanished without a trace.

The only clue is a letter from London, where Cassie once lived. Now it is up to Molly to head to there and uncover the past that her friend kept so well hidden.

The closer Molly gets to the truth, the more perilous her journey becomes. She has given up everything - her home, happiness and a chance at love - all to find Petal. But is she also risking her life?