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The graduate wizards of the High Energy Magic building of Unseen University are conducting an experiment in teleportation across worlds, normally accessible only via L-space. With Skazz and Tezz in place as test subjects, the test goes off almost without a hitch.Now, the wizards race against time to find out what has happened and fix it. Until then, Lord Havelock Vetinari is trapped in the Victorian London of Sherlock Holmes, in the unhappy custody of Dr. Watson, while Holmes finds himself in a world of magic and narrative causality rather than cold logic.Fortunately, both worlds have a mystery to investigate. Unfortunately, they will have to be investigated by the dimensionally-displaced Holmes and Vetinari.Oh, bugger...The story can be found on fanfiction dot net.
The Detective and the Diplomat provides examples of the following tropes:
All Just a Dream: Holmes' method of coping with the relative weirdness of Ankh-Morpork is to assume that the whole thing is a fever-dream.
Bad Ass: Vetinari finishes the London case by demonstrating why he is the goddamn Patrician of Ankh-Morpork.
Be Careful What You Wish For / Blessed with Suck: The cause of the Ankh-Morpork case is a card player from Genua who played Cripple Mr. Onion with a mysterious stranger, wagering his soul. He won and was granted a wish, and wished to have plenty of money on hand for the rest of his life. Everything he touches now turns to gold. To make things worse, he decided to hide out in Ankh-Morpork.
Cassandra Truth: Vetinari casually mentions to Watson that he was educated at the Guild of Assassins, leaving Watson wondering whether or not he was kidding. Later events make Watson decide he was dead serious.
Crack Fic: It has Sherlock Holmes in Ankh-Morpork. Enough said.
Ponder discovering that Lord Vetinari got sent to London by accident.
Holmes commenting about a "singularly ugly statue"... which turned out to be Detritus.
The very end.
Or Was It a Dream?: When Holmes gets back to London, he is still under the impression that the whole trip to Ankh-Morpork was a really vivid dream... until he finds the golden mouse still in his pocket...
Rule of Funny: The main reason why Holmes is six inches taller than Vetinari.
Screw This, I'm Outta Here!: After helping Ponder and Holmes locate the cause of the Ankh-Morpork case, Gaspode vanishes when they hear dwarves coming, attracted by the gold. Although he was promised a steak, he isn't feeling suicidal that day.
Sherlock Scan: Played with: Holmes pulls a single successful one on Vimes (who resents it), but due to his poor knowledge of the denizens of Ankh-Morpork the entire rest of the day is a comedy of missed deductions.
Sure, Let's Go with That: After 24 hours without sleep in a magical world, this is roughly Holmes' response when informed that the only intelligble witness to the Ankh-Morpork case is a talking dog.
Tempting Fate: Holmes maintains his lack of belief in magic even when confronted by someone claiming to be a wizard. Holmes demands proof of magic. Ponder is happy to comply.
Unusual Euphemism: Invoked when Holmes, finding himself in ill-fitting clothing, requests that Vimes fetch him a tailor. Vimes, feeling evil, asks if he would accept a Seamstress. Holmes accepts. Hilarity Ensues.
The Watson: Watson, of course, on the London end, but Ponder fills in on the Ankh-Morpork end of things.