Mrs. Wilson (Masterpiece)

It's 1963, and Alison Wilson returns home to find husband Alexander dead. Soon afterwards, a woman arrives at the door, claiming to be Alec's 'real wife.' Alison embarks on a mission of discovery to try and find out who her husband really was; but from their wartime romance to a mysterious period in India - it soon becomes clear that Alec died holding his secrets close to his chest.