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…