I read this book about 20-Apr-2003. I've read this book before. The book is copyright 1975. This note was last modified Wednesday, 03-Mar-2004 11:05:24 PST.
This note contains spoilers for the book.
Described on the cover as "his last case". That's compatible with the copyright date.
This is the one where a waiter at Rusterman's finds out something he shouldn't, and gets killed for it. As does his daughter, and a prominent electronics businessman.
I noticed an actual brand name in this book. In fact two of them—Coke, and Myers rum. Mentioned together, even.