Sam Siciliano's The Further Adventures of Sherlock Holmes: The Gentleman Burglar, featuring Maurice LeBlanc's Arsene Lupin.
In the LeBlanc canon, gentleman-burglar Lupin and consulting detective Holmes (or Holmlock Shears or Herlock Sholmes, depending on the translation) face off on several occasions -- "Sherlock Holmes Arrives Too Late," the two novellas in Arsene Lupin vs. Herlock Sholmes, and The Hollow Needle -- and these are told from the perspective of Lupin and his chronicler, LeBlanc. In The Gentleman Burglar, Siciliano remixes The Hollow Needle as a Sherlock Holmes story, set during the Great Hiatus, as Holmes is employed to find the ancient lost Treasure of France, and he quickly comes up against the notorious French gentleman-burglar Arsene Lupin, who is also most interested in finding the treasure.
I used the word "remixed" deliberately, as this isn't a straightforward retelling of The Hollow Needle, and Siciliano makes clear in his preface that he's going to do his own thing: "I see Holmes and Lupin more as kindred spirits and speculate on what might happen if the two chose to work together on the same enigma." In Siciliano's book, the battles between Lupin and Holmes before The Hollow Needle don't happen; this is their first meeting, and they really do take to each other as colleagues and, eventually, friends. Which very much carries on the spirit of LeBlanc; the end of Arsene Lupin vs. Herlock Sholmes shows that, had things gone differently, they could have been friends, and as the LeBlanc books progress Lupin becomes more of a detective and less of a thief. (One of the later books is titled in English, Arsene Lupin, Super Sleuth, which gives you an idea.) It's also in line with the children's book series, Sherlock, Lupin & I, in which Holmes, Lupin, and Irene Adler (the "I" of the series title) are childhood friends.
It's a sprawling adventure, moving from Paris to an enigmatic castle in the French countryside, to the coast of Normandy, and then a climax... well, that's would be spoilers. It's not really a mystery, and at times it feels a bit akin to an Indiana Jones story with strange puzzles, secret corridors, and so on. The third and climactic part of the book may feel a little "out there" for a Sherlock Holmes story, but it's very much in the spirit of Arsene Lupin.
Siciliano's Sherlock Holmes stories use a non-Watson narrator, in this case, Holmes' cousin Henry Vernier, and they're set during "The Great Hiatus," the period when Holmes was believed to be dead after Reichenbach Falls. Similar to The Seven Per-Cent Solution, there was no Reichenbach Falls, however; Holmes and Watson had a little bit of a falling out. Vernier's Holmes doesn't "feel" wrong, though Vernier also doesn't feel like a late 19th-century writer. There are a couple of references to previous adventures in his series, notably to The Angel of the Opera, about Holmes' investigations of the Paris Opera Ghost. (Honestly, I prefer Angel to Nick Meyer's The Canary Trainer as a Holmes-versus-the-Phantom story.)
Previously familiarity with Arsene Lupin in not required, as Henry Vernier and Sherlock Holmes are meeting the gentleman-burglar for the first time, though some familiar names, like police inspector Ganimard and boy detective Isidore Beautrelet (one of the major characters of The Hollow Needle), poke their heads in.
It was fun.