The year is 1916. Inspired by the story of Edith Cavell, twins Floss and Doss decide it is time for them to do their bit for the war effort.

Their brother and father are already away at war - and the girls get jobs at a local munitions factory.

From there, Floss soon moves on to work at the hospital, and eventually goes overseas to work at a field hospital in France.

There she is taken prisoner by the Germans and starts working behind enemy lines, nursing injured German soldiers and British prisoners.

The novel follows the dramatic, and traumatic, wartime experiences of the two sisters.