Colin Dexter's MORSE'S GREATEST MYSTERY AND OTHER STORIES (1993) contains eleven short stories of somewhat uneven quality. In order of their appearance in this collection, they are "As Good as Gold," "Morse's Greatest Mystery," "Evans Tries an O-Level," "Dead as a Dodo," "At the Lulu-Bar Motel," "Neighbourhood Watch," "A Case of Mis-Identity," "The Inside Story," "Monty's Revolver," "The Carpet-Baggers," and "Last Call."
With the exceptions of "Evans Tries an O-Level" (1977; Macavity Award, 1996), "At the Lulu-Bar Motel" (1981), and "A Case of Mis-Identity" (1989), I've basically been unable to discover dates of earlier publication for these stories. ("Morse's Greatest Mystery" was included in a 1992 mystery anthology I own, but its original date was not listed by its editor.)
Essentially this book contains four kinds of stories: four Puzzle Stories, where the reader gets to match wits with a detective and the author; five Premise Stories, each built around some unusual "What if--?" idea which is disclosed, usually at the end; one Parody; and one Ironic Successful-Adventure Story.
In my judgment, the BEST story in this collection was the wonderful PARODY of Sherlock Holmes, Mycroft Holmes, and Doctor Watson, titled "A Case of Mis-Identity." (Anyone reading it with the mistaken assumption it's a PASTICHE will probably find it very unsatisfying.)
The WORST story is the first one: "As Good as Gold." It is the Ironic Successful-Adventure Story, where far-fetched coincidences abound and SHEER LUCK is the sole bacon-and-face-saving factor at the end. It is almost as if Colin Dexter had decided to write a cruel Parody about Inspector Morse and Sergeant Lewis, showing them capable of despicable evidence-tampering. Morally speaking, I found this story deeply disturbing and disappointing, despite its numerous "clever" touches in construction.
One further story of special note is "At the Lulu-Bar Motel," which is the only "modern" story told in the first-person AND the only story set in the United States. It has, like most of the stories in this book, a Triple-Twist Plot.
While reading these eleven stories, I assigned letter grades to each of them. In my judgment, three deserved an "A", six deserved a "B", one deserved a "C", and one deserved an "F"; averaging these grades (if that seems a fair thing to do) provides this collection with an overall solid "B" grade.