The Invisible Library series by Genevieve Cogman is thoroughly entertaining and rather brilliant. There are 7 books in it currently, with an 8th coming out this December.
It's a bit of a mashup of detectival adventures in the vein of Amelia Peabody plus steampunk plus urban fantasy. The protag is a Librarian, an agent for a transdimensional secret organization that obtains books from various alternate realities for reasons both big and small. It has a Sherlock Holmes-like character (Not the protag), dragons, Fae, zeppelins, vampires, mechanical creatures, werewolves, magic, fencing, fighting, revenge, chases, escapes, true love, miracles ... ok, maybe not true love but it's a rich adventure
EDITED to take out the misleading Princess Bride stuff that seemed funny at the time 😏 Well, took out the links anyway. The list stands