August 1914: Edie Lawrence has never played by the rules. When war is declared, she disguises herself as a man to join the war effort and write about her experiences. But she also wants to catch news of her beloved Nate, who has already been sent to the Front.

Dr Lucie Garland volunteers her medical services to the war effort, only to be met with ridicule. Undeterred, she sets up a makeshift hospital in Paris, and soon loses her heart to someone unexpected.

And when Edie is injured and her gender revealed, the fates of these women intertwine in ways that neither could have foreseen . . .