Fics like The Montreuil Ring

Sherlock Holmes might be a greater opponent than what Arsène had anticipated. Arsène Lupin/Sherlock Holmes crossover in the universe of the BBC Sherlock TV show.

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1. With Justice or against it (and vice versa) by Margarine (Sherlock Holmes - Arthur Conan Doyle, Arsène Lupin - Maurice Leblanc, more)
2. To Summon A Friend by missilemuse (Sherlock (TV), Bartimaeus - Jonathan Stroud, more)
3. The Many Fields of Orange and Gold by entanglednow (Sherlock (TV))
4. The Laws of Chess by PostcardsfromTheoryland (Sherlock (TV))
5. One is Enough by sahiya (Doctor Who, Sherlock (TV))
6. Two Year Detour by crediniaeth (Sherlock (TV), Sanctuary (TV), more)
7. Logic, Meet Luna by Applepie (Sherlock (TV), Harry Potter - J. K. Rowling)
8. Bump in the Night by szm (Sherlock (TV))
9. It's a Jungle Out There by improbability (Sherlock (TV), Monk - Fandom)
10. A Pocketful of Posies by entanglednow (Sherlock (TV))
11. We're All Captains Here by entanglednow (Sherlock (TV))
12. Astrobiology by imriebelow (Sherlock (TV), Young Wizards - Diane Duane)
13. Mineralogy in Slow Motion by entanglednow (Sherlock (TV))
14. Unexpected Journeys by story_monger (Sherlock (TV))
15. Combat Medic by Lunik (Thor (2011), Sherlock (TV))
16. Twenty aspects of Sophonisba's personal extensions to Canon by Sophonisba (Sherlock Holmes - Arthur Conan Doyle, Sherlock Holmes & Related Fandoms, more)
17. The Grandfather Paradox by Trivena_Butterfly (Arsène Lupin - Maurice Leblanc, Lupin III)
18. Family Affairs by s0mmerspr0ssen (Sherlock (TV))
19. Gus (and John) Walks into a Restaurant by gladdecease (Sherlock (TV), Psych)
20. The Murder of Cardinal Tosca by JohnAmendAll (Monty Python's Flying Circus, Sherlock (TV))