The category for this movie might be 'mystery', the plot however certainly isn't. Within the first five minutes of the film you found out that Jerry is corrupt and you meet McKay, the man who'll certainly solve the crime. This makes you wonder why the movie would be interesting.
Still, like most of Hitchcock's features, it's not what the movie is about, it's what you do with the plot that makes the movie. Zinneman's first is quite good for a debut: the film is sober but effective. The relation between McKay and his female assistant Mitchell is more interesting than 95% of the working relations you normally get to see. McKay's forensic quest is quite interesting too.
Bear in mind that it's a debut and watch a very nice film.
Still, like most of Hitchcock's features, it's not what the movie is about, it's what you do with the plot that makes the movie. Zinneman's first is quite good for a debut: the film is sober but effective. The relation between McKay and his female assistant Mitchell is more interesting than 95% of the working relations you normally get to see. McKay's forensic quest is quite interesting too.
Bear in mind that it's a debut and watch a very nice film.