When twenty-one-year-old Madeleine Hamilton is asked to smuggle two young pupils to Berlin, she nervously agrees. But, when they run into trouble on the train, it is Maddie's turn to be saved by a chance encounter with a handsome man.

When twenty-one-year-old Madeleine Hamilton is asked to smuggle two young pupils to Berlin, she nervously agrees. But, when they run into trouble on the train, it is Maddie's turn to be saved by a chance encounter with a handsome man.

Bletchley Park. September, 1939.

A year later, Maddie is undertaking training in Morse code when a familiar face shows up unexpectedly. The attraction between them is as deep as it is instant, but Maddie knows one person holds the potential to harm her country and her heart - and it is her duty to protect both…