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In this collection of short stories, a Scotland Yard detective turns to a retired professor of philosophy to help him solve his harder cases. I found the plots contrived and the relationship between the detective and the professor unbelievable (the detective takes orders from him, helps him engage in illegal behaviour and otherwise lets him interfere in cases, oddly with no pushback from his superiors at the Yard). But if you enjoy mystery stories with a gimmick, you may enjoy these.
Actually these stories (as "chapters") were sometimes a three but mostly a four. They are more in the "pulp" tradition than not. Since I do enjoy a good "pulp" offering, I will no doubt read the next book.
A detective takes his most unusual or difficult cases to Professor Quarles who approaches the cases from thinking of theory first and trying to make the evidence fit. The detective does the opposite--evidence first then conclusion. Each of these cases are short and many are developed poorly. I kept reading because I thought it might get better, but it didn't really.
Christopher Quarles is a budget Sherlock Holmes. The mysteries are clever but end rather abruptly without as much development as the Doyle stories. Quarles' personality is more crabby and churlish. I enjoyed it enough to download the sequel to it.