Because the August selection is a classic noir story, I thought that I would nominate something completely different for September...So I nominate
The Moonstone by
Wilkie Collins.
Harry T says: "The Moonstone", published in 1868, is widely regarded as the precursor of the modern mystery and suspense novels. T. S. Eliot called it "the first, the longest, and the best of modern English detective novels"...A fabulous story. Both a classic and fun to read...
It is available at MobileRead here:
https://www.mobileread.com/forums/showthread.php?t=28213