I am a sucker for a good whodunit, and "Inspector Hornleigh" was an excellent one. It had an elaborate plot and I could not guess the murderer until... come to think of it, I didn't guess the murderer until it was revealed at the end of the picture, so well-written was the screenplay. And, brother, it was written, and written, and...
This picture was loaded with dialogue, enough for 2 or 3 pictures, but in the end I felt it was all worth it. I enjoy Gordon Harker more each time I see him and he is very convincing when playing a police inspector. Here he is Insp. Hornleigh of the title, and he was every bit as good as he was as Insp. Elk in "The Frog" (1937). He is aided by Alastair Sim, playing his weak-minded sidekick police sergeant. Speaking for myself, I did not mind his antics, as films of the 30's and early 40's often tried to blend comedy and mystery, more often than not a futile effort, I have found. But it worked here.
The rest of the cast was competent, although two of the suspects looked very much alike, causing occasional confusion. Another reviewer mentioned that the sets looked cheap - that may be, but I gave it a pass and was not conscious of an effort to pinch pennies in any phase of the production.
All in all, a worthy effort and worth your while, because I always feel that, ultimately, the play's the thing, don't you?