Hitchcock often injected comedy inot his films but this is the comedy thriller to top them all. It could, in lesser hands, have all gone wrong. A triumph!

John Forsythe is the biggest name here and many have cite the lack of stars as the weakness here but I realy love this film despite Frederick Staffords slight charisma defficiency

Hichcock for once showed the brutal sexual murder here, which is very powerful and disturbing. He then uses that to underline all that is mearly suggested in the remainder of the film.

This does not seem to be avilable in region 2 format (a shame) The movie is really a stage play performed in front of a camera. This limitation give it a claustrophobic quality that adds to its power

Like Dial M for Murder this is a stage play on film. Becuse of the era it was filmed the nature of the relationship between the two anti-heros is overly ambiguous but it works just the same

Bergman is again perfect in the wonderful take on Fraudian psychology and the never bettered use of amnesia (contains the inspiration for Mel Brook's Professor Little old man in High Anxiety)

Blackmail started as a silent movie but was turned into Talkie half way through. Hitchcock shows his class by innovating with the new technology from the start. the "knife" scene is brilliant