Englishmen know him as Faber, but to the Fatherland, he's the loyal and lethal spy know as "The Needle." On his way back to Germany to report personally to Hitler, Faber is shipwrecked on an island outpost where he befriends Lucy, a beautiful Englishwoman who lives there with her family. Lonely and scorned by her bitter, crippled husband, Lucy falls for the enigmatic stranger, not knowing that he's a traitor determined to prevent the D-Day invasion.