Following the armistice, Mary Kiten, a volunteer nurse in northern France, is ready to return home to England when she receives a surprise telegram requesting that she report to Paris. The call comes from her Uncle Arthur, a security chief at the Peace Conference.
Within minutes of arriving at the Majestic Hotel in Paris, Mary hears a commotion in the street outside. A man has been shot and killed. She is horrified to earn that the victim is her uncle. The police report the attack as a chance robbery by a known thief, who is tracked down and killed resisting arrest.
Mary is not convinced as circumstances and the gunshot wound do not indicate theft as a motive. A scribbled address on Arthur’s notepad leads to her discovery of another body, a Russian Bolshevik. She suspects her uncle, and the Russian, were murdered by the same hand.
To investigate further, Mary takes a position working for the British Treasury, headed by J M Keynes.
But Mary soon finds herself in the backstreets of Paris and the criminal underworld.
What she discovers will threaten the foundations of the congress.