Disappointed in a Book

What you ever read a book that you looked forward to reading and been disappointed? I was so looking forward to reading the next book in Sue Grafton's Kinsey Milhone alphabet mysteries, U is for Undertow. There was virtually no mystery to it at all. Early on I had identified the kidnappers/murderers, but I don't think that was intended to be hidden from the reader. I kept waiting for a twist, but there wasn't one. The ending was totally predictable, including a gratuitous murder. I learned some more about Kinsey's family life, but that wasn't that interesting. I do appreciate the Crime and Punishment type of mystery where the reader knows who the killer is, and the crux of the novel is discovering the manner in which the detective unravels the mystery. This was the book that the television series Columbo was patterned on, but U is for Undertow did not have any of the suspenseful unraveling that a novel of this type must have. Oh well, time to move on in my reading world. I will be teaching Invisible Man by Ralph Ellison and Reservation Blues by Sherman Alexi, two outstanding novels whose prose and thematic elements will reaffirm the enjoyment I get from reading an excellently written piece of fiction. And of course, I know and recognize the difference between older and new literary classics and other works of fiction, but I expected more from Sue Grafton based upon her previous works. If you have read this novel and have a different point of view, I would love to hear it, or if you agree with me, I would love to hear that as well.