Gene Barry is "Donovan", a CIA agent sent to London to help uncover a cold war espionage ring. He is pretty much captured upon arrival, but luckily manages to quickly escape from his country house prison with the help of "Peter Langley" (Tom Adams) and together with the help of "Col. Redmayne" (Richard Todd) they embark on an investigation to find the spy! Most of this reminded me of an episode of "Bewitched" only it wasn't anyone's nose that was twitching. The production is cheap, the script woeful and the performances might legitimately be described as truly worthy of the occasional appearance from Joan Collins ("Anne") at her most glamorously sterile. The plot plods along with an inevitability to it that leaves no room for any suspense, and the fight scenes are so expertly choreographed as to be little more than gymnastics with tomato sauce. London in the late 1960s was a colourful, bustling city and the film at least manages to convey some of that vibrancy, but otherwise this is really just duff.