(by The_Void on 6 July 2009)

This is another film made in Germany in the sixties, based on a story by Edgar Wallace, and directed by Alfred Vohrer. It's also one of the best films of its type. The plot is typical of Edgar Wallace; it's wacky and features a plethora of strange and unique characters. As the title suggests, the film makes a river (the Thames, naturally) its central setting and this is very important for the plot as it focuses on a murderer with a strange modus operandi. Scotland Yard have been called in to investigate a series of murders happening on the river - witnesses have reported seeing a man in a wetsuit and all of the victims are found to have been killed by a harpoon - thus leading the murderer to be nicknamed 'The Shark'. Inspector Wade is called in to look into the murders and it soon becomes apparent that they may have something to do with a local smuggling operation. His efforts are concentrated on one family in particular that owns a bar and, allegedly, a large fortune also.
Alfred Vohrer stylishly directs the film, and seems to have a fascination with mirrors - as there's plenty of shots featuring characters' reflections. The plot is well worked and the way that the investigation is presented is interesting; although to be honest I would have proffered to have seen more of The Shark. A murderer swimming around a river and shooting people with a harpoon gun is a fascinating idea, but it's not capitalised upon as much as it could have been. The central cast is good and features many familiar Krimi faces - including Joachim Fuchsberger, Eddi Aren't and Klaus Kinski, who has a small but memorable role as a smuggler. There's plenty of good set pieces to keep the interest up, although the focus of the mystery is not on the identity of The Shark but on the reasons for the killing; meaning the final unveiling of the villain at the end is a bit of a moot point; although it does at least come as a surprise. Overall, this is an excellent Krimi that works in spite of a couple of problems and it will certainly be of interest to fans of the genre.