August 1914. As World War One begins, two women are determined to do whatever they can for their country.

Edie Lawrence has never been one to play by the rules. As war in Europe is declared, she disguises herself as a soldier and enlists with a London regiment, with the aim of becoming the first woman to report from the battlefield. But also where she can catch news of her beloved Nate, who has already been sent to the Front.

Dr Lucinda Garland volunteers her medical services to the War Office. But her offer is met with rejection. Undeterred, she works with the French Red Cross to create a pioneering all-female-run military hospital in Paris. As Lucinda struggles to cope with the horrific injuries that flood her hospital, she finds herself losing her heart to someone unexpected.

And when Edie is injured and her gender revealed on Lucinda's operating table, the fates of these brave women, each determined to do whatever they can for their country, but also for womankind, intertwine in ways that neither of them could ever have foreseen.