1916. Poppy is being transferred to an enormous new munitions complex in Gretna on the Scottish border. As a member of the Women's Police Service it's her job to maintain law and order so that the factory workers can safely carry out their vital war work. She soon makes friends and even starts to open herself up to the possibility of love. But then she sees something in the dead of night and suddenly the dangers of the war are no longer far away on distant shores. With the enemy hot on her heels and no idea who to trust can Poppy save herself - and avert disaster for her country?

Part of the Bobby Girls series.