May 1944. The eve of the Allied invasion of Europe. When American OSS agent Craig Osbourne is taken aboard a German E-boat off the coast of Brittany, he thinks that his war and possibly his life are over. But the Lili Marlene is actually operated by the Royal Navy out of an ultrasecret base on the English coast. And it will soon be returning Osbourne a highly trained assassin to occupied France. There, he will help the beautiful twin sister of a dead British agent infiltrate a German High Command briefing on the defense of the Atlantic Wall. Nothing will prevent the coming Allied assault but its success may well depend on the outcome of this mission "