It is 1917, WWI, trench warfare continues between the English and the Germans in the flatlands of northern France. Lance corporal Tom Blake (Dean-Charles Chapman) is ordered to deliver a letter to the front-line warning of a German ambush they are about to run into and 1600 lives are at risk, including Blake’s brother’s. To deliver this message he has to cross the occupied French countryside but he is assured the Germans have already retreated as part of their ambush plan.