The "Whistler" was very odd for a B-movie series and so much unlike its contemporaries (such as Charlie Chan or The Falcon). Richard Dix starred in 8 of the 9 films. though he played a totally different character in each--sometimes a good guy and other times a bad one. In many ways, this is reminiscent of Universal's INNER SANCTUM series in that the same actor often played different roles in each film AND the series was NOT the standard detective film but an anthology series--much like TV's TWILIGHT ZONE. The "Whistler" in the titles of most of the films is an unseen guy in the shadows that narrates the film and occasionally makes comments during the film. This format was apparently created for the radio version of "The Whistler".
In this first of the series, Dix plays a depressed man who, instead of suicide, pays an unknown assassin to kill him!! While the whole idea is ridiculous and contrived, it is pretty entertaining--especially when Dix changes his mind and truly wants to live but he isn't sure who is coming to kill him or how to stop the contract! The biggest negative, other than the silliness of the story, was the narration by The Whistler. This narrator talks too much--sometimes making comments or saying things that were obvious to the viewer. I haven't seen the rest of the series, but surely hope this was corrected.