Lord Peter Wimsey and Harriet Vane, Nick and Nora Charles, Charles and Kate Sheridan, and in one unexpected offering Clark Gable and Carole Lombard—all have one thing in common: they are all detective marriages. Husband and wife teams, solving crimes, bringing their own domestic wrinkles to the task. Agatha Christie even wrote one, Tommy & Tuppence, as did Elizabeth Peters. The couple that solves crime together is more common than might first be suspected. And all of them have the unexpected about them, aspects of their relationship that would seem to make it unlikely, unstable, or unmanageable. And yet, they work.

The hallmark of these couples, of course, is the combined ability to solve murders, but that is only an aspect of what may be the chief attraction—for them and for the reader. Along with all the other (presumed) pleasures of the relationship, the intellectual rises to the top as an aspect of love. Unspoken though it may be in many instances, these are people drawn to each other by their shared appreciation for thinking.

And acting on the results.

Odd as many of them may seem, perhaps the least likely is the marriage of a young Mary Russell to her mentor/colleague, Sherlock Holmes.

When I encountered the first volume of Laurie R. King’s series, The Beekeeper’s Apprentice, I read the description and thought: And just how does that work? Sherlock Holmes is the most dedicated bachelor in detective fiction. Many writers have attempted to explain that, even work on the assumed “romance” between Holmes and Irene Adler, and have mined the subtext of his condition for decades, sometimes to good effect.

But married?

In a display of elegant reimagining, solid logic, and excellent prose, King convinces us that her version of the Holmes Story is the true tale underlying the gloss of fiction created by Dr. Watson. In the first twenty pages a new reality is established, making these novels feel more like revealed history than fanciful speculations. As it has turned out, she established a premise that has resulted in 18 novels (give or take) and some shorter works, each one adding to the Holmes mythos and providing terrific entertainment along the way.

The series proceeds chronologically and follows history closely. From time to time we have the added pleasure of seeing a fictional character enter the story as if part of actual history (the rescue of Kim, for example—yes, Kipling’s Kim) and the new one—Castle Shade—more or less continues in that vein.

Almost literally. After wrapping up a twisted affair in the Riviera, Holmes and Russell are summoned to Romania at the request of Queen Marie. They arrive at Castle Bran where they are presented with the problem (in the form of threats against the queen’s daughter) and tasked with finding those responsible.

We are in the thick of atmospheric evocations. Castle Bran is reputedly that castle—Dracula’s. The vampire haunts the novel. Both Russell and Holmes are grounded materialists, so obviously ghosts, devils, vampires and so forth are not the perpetrators. But they are tools.

Politics play a role—this is 1925 and Romania is slowly recovering from the shocks of World War I—as does folklore. Holmes and Russell must move carefully through a landscape fraught with the kind of peril born out of superstition and the frayed sensibilities of a people still trying to find their way into a new world without losing too much of the old.

King deftly portrays the country, the culture, the politics, and the history and moves her characters through this landscape on this most delicate quest. As in past novels, King displays a deep understanding of history, and her attention to detail is everything one would expect from a Sherlock Holmes novel.

But as I said, the pleasure of this novel and all the others in the series is in the dynamic between Russell and Holmes and it remains compelling and convincing. The biggest difference between Mary Russell and her husband is age and therefore experience, but they are intellectually matched and derive a significant part of their delight in each other from that fact.

King has humanized Holmes, perhaps more believably than most other attempts, which have generally focused on the uncommon intelligence and observational skills of the detective, so much so that many incarnations have rendered the character all but a machine. The original stories show a more rounded person, someone who it must be remembered could be extraordinarily kind. Whatever the reason—fascination with the exotic if nothing else—Holmes has been too often portrayed as some kind of intellectual freak. Conan Doyle, if he had any message beyond telling a good yarn, was that the chief distinction between Holmes and his fellow humans was his willingness to Pay Attention. Yet the message received seems to have been “thank heavens there’s only one of him, no one could be like that!” King has spent time in this series, it seems, undoing the various boxes into which Holmes has been placed. (There have been a number of stories presenting the idea that Holmes was, in fact, an alien, which explained his unique powers. Fun stories, to be sure, but again that trend of removing Holmes from the realm of the human.) King’s Holmes begins as someone who had fled London, tired of The Game, but who started his career much younger than the man in Dr. Watson’s tales (a nod perhaps to Aesop, who was said to have dressed as an old man in order to be taken seriously by those who would never accept wisdom from a young man?) and was interested in his bees, his solitude, and perhaps rejuvenating himself after near burn-out. The opportunity of training a protege in the form of a young girl who invades his quiet gives him a chance to…

Well, that would seem to be an ongoing journey, for both of them. Russell/Holmes is very much a spring-autumn romance—and there is romance, albeit understated and plausibly private (these are written in first-person by Mary)—but they have found each other as rough equals and by implication natural companions.

All that is well and good, but the best part of these novels is Mary herself, who is one of the finest sleuths to be found. Tough-minded, resilient, a scholar first, detective and occasionally reluctant spy, it is from her we learn all this, her voice that takes us through the adventures, and Holmes often takes a backseat to Mary’s navigation.

And the mysteries are fine. Just the sorts of unlikely, bizarre, exotic tangles one should expect from a Sherlock Holmes tale. But again, rendered in terms of human capacity and interest. In any event, so far each book has left me happily looking forward to the next. Mary Russell and Sherlock Holmes have together reinvigorated what had come close to being overdone and overworked.