I saw this movie many years ago on the late late show and thought it was an outstanding film about espionage in Saigon during the Vietnam War. The acting is very good with Joseph Cotten and Martha Hyer heading a fine cast. It is truly an unusual film as I don't know of any other movies which deal with the subject of spying in Saigon during Viet Nam. It was made in 1967 and so was very topical at the time and is truly a walk down memory lane for those of us who living through it during the 1960s. Joseph Cotten plays an Army colonel who is trying to find out who the spy is and Martha Hyer plays a computer programmer whose husband is the spy. It keeps you on the edge of your seat the whole time. I would like to see this movie come out on VHS or DVD. It is definitely worth watching.