The Case of the Caretaker's Cat by Erle Stanley Gardner

I just finished reading a Perry Mason novel by  Erle Stanley Gardner called  "The Case of the Caretaker's Cat". I've read Gardner before and enjoyed him, but this one, eh, not so much. The first third moved well, but the theatrics and the extended 'reveal' at the end were too much for my taste. I'd grade this a C #60