Nathan Juran directs this thriller starring Richard Greene and Stephen McNally. British gentleman Sir Ronald Burton (Greene) investigates the mysterious disappearance of two of his friends. When Burton learns that his friends were working for the dangerous Count von Bruno (McNally) he sets out to find out what really happened to them. As Burton gets closer to the truth he discovers that his friends have fallen victim to Count von Bruno's vendetta against the British forces and must find a way to help them escape. Rita Corday, Lon Chaney Jr. and John Hoyt also star.