Up to this point, I found the entries in "The Whistler" series to be enjoyable B movies, but with "Mysterious Intruder", something seems to have gone wrong. Let me make clear that I didn't think that this entry was a terrible movie. But all the same, it doesn't seem to fit with the other entries. For starters, the story is more of a standard B movie detective movie instead of a more suspenseful story. And this particular detective story really requires you to pay close attention - if you are not keeping careful mental notes to what's going on, you'll likely get lost pretty quickly. I will admit that if you're patient enough to sit through the movie, you'll be rewarded with a dark ending that does seem to fit other movies of the series. Those who also like detective dramas of the 1940s probably will get some extra enjoyment as well. But as I said, it isn't really a true "Whistler" movie, and must be considered somewhat of a misfire.

The first four "Whistler" films may have been low-budget, but they were neither cheap nor dull; "Mysterious Intruder" is both. It plays more like a run-of-the-mill private-eye film, and the revelation of the killer(s) is pretty ho-hum as well. It doesn't really feel like a part of the series, apart from the ironic ending, which at least remains intact. The cast is pretty unmemorable this time as well; only an uncredited Kathleen Howard, as a vaguely threatening middle-aged lady, manages to make something of her role in about five minutes of screen time. The film is not without interest - however all its predecessors in the "Whistler" series are significantly better. ** out of 4.

The Whistler was both a radio show and a B-movie series from Columbia Pictures. Unlike the usual B-films (which were mostly detective films), this series was more like episodes of the "Alfred Hitchcock Presents" television series--each a unique story involving human nature and each one being unique and unrelated to the others. Additionally, all but the final film starred Richard Dix--who played very different characters in all the films.In this film, Dix plays a private detective who isn't especially honest. When a kindly old man comes to him for help, Dix appears willing to use a bit of larceny to cash in on the man's trust. Throughout the film, you see that above all else, Dix is a man out for himself. Additionally, other selfish characters abound--and soon practically everyone wants to cash in on the old man's secret.This film is probably the best in the series because the script is much tighter and without the plot holes that sometimes impeded the series. While there are many twists and turns, the script never becomes too complicated and it ends with a wonderful and ironic twist. Additionally, the supporting staff is much better than usual--having many great character actors on hand, such as Mike Muzurki, Barton MacLane and Charles Lane.The score of 8 is relative to other B-movies. For the genre, it's among the best and not to be missed by old film buffs.

William Castle the director of many low B budget films made this into another great Whistler series starring Richard Dix as Don Gale, a rather shady private detective who had a nice brunette secretary named Joan Hill, (Nina Vale) who assisted him with all his clients and especially a little old man. This little old man wanted to locate a young girl named Lund in order to tell her that she was worth lots of money and he wanted Don Gale to try and local this young girl from his past. Don Gale has other ideas and decides to find a girl to impersonate this young girl in order to find out just how much of a fortune she is worth and what it just might be. Several people get murdered and this dark tale takes you down many blind alley's with all kinds of ugly and evil men and woman. Enjoy, it is a good mystery, and Richard Dix had a certain charm that made his acting so suspenseful.