Colin Dexter: The Jewel That Was Ours
From the Publisher:
The case seems so simple, Inspector Morse deemed it beneath his notice. A wealthy, elderly American tourist has a heart attack in her room at Oxford's luxurious Randolph Hotel. Missing from the scene is the lady's handbag, which contained the Wolvercote Tongue, a priceless jewel that her late husband had bequeathed to the Ashmolean Museum just across the street. Morse proceeds to spend a great deal of time thinking - and drinking - in the hotel's bar, certain the solution is close at hand - until conflicting stories, suspicious doings, and a real murder convince him otherwise...
Colin Dexter: The Jewel That Was Ours. Ivy Books, ISBN: 0804109818 (February, 1993), $6.99.