In January 1917, five wounded French soldiers, their hands bound behind them, are brought to the front at Picardy by their own troops. They are forced into the no-man's land between the French and German armies and left to die in the crossfire.

For more than two years, this brutal punishment is hushed up. Mathilde Donnay, unable to walk since childhood, begins a relentless quest to find out whether her fiancé, officially "killed in the line of duty," might still be alive. Tipped off by a letter from a dying soldier, the shrewd, sardonic, and wonderfully imaginative Mathilde scours the country for information about the men.

As she carries her search to its end, an elaborate web of deception and coincidence emerges, and Mathilde comes to an understanding of the horrors and the acts of kindness brought about by war.

A Very Long Engagement is many things at once: an absorbing mystery, a playful study of the different ways one story can be told, a moving and incisive portrait of life in France during and after the First World War, and a love story of transforming power and beauty.