Colin Dexter: The Secret of Annexe 3
From the Publisher:
Much too early on New Year's Day, a grumpy Inspector Morse is summoned to investigate a murder at the Haworth Hotel. The victim is still wearing the Rastafarian costume that won him first prize at the hotel's New Year's Eve party; his female companion and the other guests in the annexe have vanished. It's a mystery that's a stretch even for Morse. But with pit-bull fervor he grabs the truth by the throat and shakes loose the bizarre secrets of a cold-blooded crime of passion...
Colin Dexter: The Secret of Annexe 3. Ivy Books, ISBN: 0804114897 (February, 1998), 285 p., $6.99.