The Man in the Corduroy Suit

Leonard Flood, a British spy is ordered to investigate the attempted poisoning of a retired vetting officer named Willa Karlsson. After a series of recent security breaches British intelligence is terrified by the possibility that she was in fact a Russian agent, and that Moscow poisoned her upon her retirement since she was no longer useful to them. When Leonard discovers that Willa's story is not one of betrayal and treachery but one of friendship and a deeply ethical sense of duty, he is faced with a stark choice: does he hand her in to her masters, or does he help her escape to a new life?