This book has a format quite similar to the Sherlock Holmes stories. It can be annoying at times when the author holds his cards too close to his chest. The plots are quite good and some of the solutions are very clever.
This is like all the other books featuring Dr Thorndyke. The storyline is always good, but I get a bit tired of some repetition I noticed, and the long winded way detail is expained sometimes. I find myself skipping a few lines to save time. But a good book for all that, and it's only my opinion. You may find it quite a different story.
The detective stories were made interesting by their clever plots, and enjoyable by their lack of gratuitous violence. The final solutions were worked out based reasoning, a bit like Sherlock Holmes, but more informal