The drama follows Alison Wilson who thinks she is a normal, happily married woman. But when her husband Alec suddenly dies, a woman turns up on her doorstep, claiming that she is the real Mrs. Wilson. Alison is determined to prove the validity of her own marriage - and Alec's love for her - but is instead led into a world of dark and troubling secrets. Alec was a British spy and a best-selling novelist and Alison is pushed to the very brink to find out the truth.
Did You Know?
MI6 is Britain's foreign intelligence service, while MI5 is Britain's domestic intelligence service. See more
Many of the street scenes occur during the period of the Blitz (in London) where draconian lighting restrictions for public road traffic. Buses are shown with all lights blazing away normally, both inside views and exterior views, and no windows are netted to protect passengers and crew from blast damage. No vehicles have masked headlights, either. See more