The Piccadilly Murder is a novel with an impossible crime, the second masterpiece of 1929, when the first, I remember, was the very famous The Poisoned Chocolates Case. And with the latter, The Piccadilly Murder, it shares characters and methods of committing the crime, and therefore it can be considered that the two novels form an inseparable pair. The characters are: Ambrose Chitterwick, one of the six members of the Crime Club, an imaginary club, but not so much, that seems to echo The Det...