The Beekeeper's Apprentice, or, On the Segregation of the Queen is the first in a series of mystery novels by Laurie R. King, which feature an elderly Sherlock Holmes and a youthful half-American student of theology, one Mary Russell. It was first published in 1994, and has to date seen eleven novel-length sequels. It’s not science fiction or fantasy—I may have felt the need for a wee break from SFF—except inasmuch as it involves Sherlock Holmes, a character frequently beloved of many people who’re also SFF fans—but it is a brilliant book.
I may be the last person in the world to realise that this book existed, and that it was good. But in case there are any other poor benighted souls out there who, like me, somehow escaped hearing about its virtues in the last couple of decades, I propose to tell you about them.