If you are intrigued by the kind of locked room/impossible crime mysteries that were specialties of Clyde B. Clason, you might be interested in a couple of other Clason mysteries, written a few years after he wrote "The Purple Parrot."
"Dragon's Cave" is a fairly complex but quite enjoyable mystery, involving the murder of a rich Chicago man, found murdered in a locked room, the apparent victim of an antique halberd, one of the antique weapons he collected. How could the murder have taken place inside that locked room - and why did the killer choose such a large and awkward weapon?
In "Poison Jasmine," Professor Westborough is on the scene in California, when a fellow-guest at the home of a world-famous perfume maker is poisoned at the dinner table - in plain sight of several guests, none of whom saw anyone tampering with the victim's food. It's another impossible-crime thriller, and a very clever one.
The links, by the way, will take you to my earlier blog posts about those books - where you'll find links to my podcast reviews and the book pages on Amazon.