Former OSS officer Alan Holiday, now living in London, is visited on New Year's Eve by Catherine Carrel who says she is a close friend of Jules Lemoine who served with Holiday during the war. Lemoine urgently requests that Holiday go to Paris on a secret mission. Lemoine visits and wants Alan to deliver a reel of tape which he gives him, and keeps a fake reel himself to deceive enemy agents. Lemoine is killed and the fake tape stolen. Holiday, poses as an assistant to photographer Louis Vernay, and they take three models along to further the ruse.