Would someone be willing to create a series page for the Robert Duvall trilogy? The first book is "The Ivory Snuff Box", the second is "The Blue Lights", and the third is "The Film of Fear". The trilogy is variously called "The Curious Cases of Detective Richard Duvall" or "Mysterious Cases of Detective Richard Duvall". Here are the relevant pages:
https://www.goodreads.com/book/show/2...
https://www.goodreads.com/book/show/4...
https://www.goodreads.com/book/show/1...