Some love stories change us for ever.

For the last seven years, Mary O'Connor has waited for her first love. Every evening she arrives at Ealing Broadway station and stands with a sign which simply says: 'Come Home Jim'.

Commuters might pass her by without a second thought, but Mary isn't going anywhere. Until an unexpected call turns her world on its head.

It will take the help of a young journalist called Alice, and a journey across the country for Mary to face what happened all those years ago, and to finally answer the question: where on earth is Jim?