The true story of a forgotten Scottish hero, the Reverend Donald Caskie, who was known as the Tartan Pimpernel, when the Germans invaded France in 1940. He fled Paris and reached southern France where he refused the chance of safe passage on the last ship bound for the UK and fled to Marseille instead. There, he ran a Seaman's Mission, living a double life and passing the close scrutiny of the Vichy Police, helping British and Allied soldiers to freedom across mountains into Spain. Dr Caskie was finally imprisoned by the Gestapo and sentenced to death.