From Super Detective Picture Library #188, January 2, 1961.
Shortly after Dunkirk, a German attack on a coastal area of France results in John Steel being severely wounded. An older French farm couple find him and nurse him back to health; his identity remains a secret so they call him the Shadow. After he is able to leave to make his way to England, he is sickened to learn that the Germans have killed the couple. He slows his return long enough to do some serious damage and that will let him find a German training camp for would-be 'Englishmen'.