Scotland, 1915. A group of teenagers from very different backgrounds meet for an idyllic picnic, but the war across the Channel is proving increasingly impossible to ignore, and all too soon they will be engulfed by The Great War.

Determined to forge their own paths during a time of enormous upheaval, the five friends encounter not only the horrors of the trenches, but also the thrum of first love, and the political struggles of pacifism and women's rights. Their lives will be changed forever - and nothing will ever be the same again.