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  • Knave of Diamonds

Knave of Diamonds

Mary Russell and Sherlock Holmes #19 / 20
by Laurie R. King
Knave of Diamonds (Mary Russell and Sherlock Holmes #19) by Laurie R. King
Unrated

Mary Russell’s allegiances are tested by the reappearance of her long-lost uncle—and a tantalizing case not even Sherlock Holmes could solve.

When Mary Russell was a child, she adored her black sheep Uncle Jake. But she hasn’t heard from him in many years, and she assumed that his ne’er-do-well ways had brought him to a bad end somewhere—until he presents himself at her Sussex door. Yes, Jake is back, and with a load of problems for his clever niece. Not the least of which is the reason the family rejected him in the first place: He was involved—somehow—in the infamous disappearance of the Irish Crown Jewels from an impregnable safe in Dublin Castle.

It was a theft that shook a government, enraged a king, threatened the English establishment—and baffled not only the Dublin police and Scotland Yard, but Sherlock Holmes himself. And, now, Jake expects Russell to step into the middle of it all? To slip away with him, not telling Holmes what she’s up to? Knowing that the theft—unsolved, hushed-up, scandalous—must have involved Mycroft Holmes as well?

Naturally, she can do nothing of the sort. Siding with her uncle, even briefly, could only place her in opposition to both her husband-partner and his secretive and powerful brother. She has to tell Jake no.

On the other hand, this is Jake—her father’s kid brother, her childhood hero, the beloved and long-lost survivor of a much-diminished family.

Conflicting loyalties and international secrets, blatant lies and blithe deceptions: sounds like another case for Mary Russell and Sherlock Holmes.

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MysteryHistorical Fiction
Release date: June 10, 2025

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Laurie R. King

Laurie R. King

Laurie R. King writes mysteries that feel less like puzzles laid out on a table and more like lives unfolding under pressure. Her stories take their time, circling around character, memory, and place, until the truth emerges not as a single revelation, but as something earned.

Born in California in 1952, she grew up surrounded by landscapes that would later echo through her work, coastlines, small towns, and the quiet edges where ordinary life brushes up against something more uncertain. Before turning fully to fiction, she studied theology, an influence that still lingers in her writing through questions of belief, morality, and identity. Those themes rarely sit on the surface, but they shape the way her characters think, doubt, and act.

Read more ...

Her early novels introduced readers to Kate Martinelli, a police detective navigating both crime and personal complexity in contemporary settings. But it was with Mary Russell and Sherlock Holmes that her work reached a wider audience. Rather than simply revisiting a familiar literary figure, she reimagined the world around Sherlock Holmes by placing him alongside a partner who challenges him intellectually and emotionally. The result is a long-running series that blends classic detective fiction with historical depth and evolving character dynamics.

Her approach to mystery leans toward atmosphere and psychology. The crimes matter, but so do the people caught in their wake. Settings are not just backdrops, they shape the tension, whether it’s an English village carrying quiet secrets or a distant landscape marked by political unrest. Across her books, there’s a consistent sense that understanding motive requires more than logic, it requires empathy, patience, and a willingness to look beyond the obvious.

Recognition has followed over the years, including major awards in the mystery genre, but what stands out more is the way her stories have endured. Readers return not only for the intrigue, but for the characters who continue to grow, change, and surprise.

Laurie R. King’s work sits comfortably between tradition and reinvention. It honors the structure of classic mystery while allowing space for reflection, complexity, and the kind of storytelling that lingers long after the case is closed.

Mary Russell and Sherlock Holmes

Mary Russell and Sherlock Holmes opens with a quiet encounter on the Sussex Downs, but it doesn’t stay quiet for long. What begins as a meeting between a retired detective and a sharp-minded young woman gradually reshapes one of literature’s most familiar partnerships into something far less predictable, and far more human.

Mary Russell steps into the story not as an observer, but as a mind that refuses to stand in the shadow of Sherlock Holmes. Their connection unfolds slowly, built on intellectual friction, shared curiosity, and a mutual recognition that neither of them sees the world in quite the usual way. Over time, the dynamic shifts, mentor and student becoming equals, partners, and something deeper, creating a relationship that evolves alongside the mysteries themselves.

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The series moves through the early twentieth century with a sense of quiet tension. War has left its mark, borders feel uncertain, and beneath the surface of polite society, secrets carry real weight. Investigations stretch beyond drawing rooms into political intrigue, hidden networks, and distant landscapes, where the line between personal stakes and global consequences begins to blur. Each case is more than a puzzle, it’s a doorway into a changing world.

What lingers is the tone, measured, observant, and often introspective. Clues emerge through conversation, through small details, through the spaces between what is said and what is withheld. The storytelling leans into atmosphere as much as deduction, giving equal importance to character growth, memory, and the cost of knowledge. Russell’s voice, thoughtful and precise, brings a different kind of intimacy to detective fiction, one that invites readers to think alongside her rather than simply follow the trail.

Over the years, the series has built a steady following among readers who appreciate historical mystery with depth, where relationships matter as much as resolution. It respects the legacy of classic detective stories while quietly reworking their structure, asking what happens when the legend is no longer alone at the center of the narrative.

For those drawn to richly layered mysteries, evolving partnerships, and a world where intellect and emotion are always in conversation, this is a series that reveals itself gradually, and rewards those who are willing to linger.


Mary Russell and Sherlock Holmes consists of nineteen books and series is set to expand with the upcoming release of one more book. The current recommended reading order for the series is provided below.

The Beekeeper's Apprentice (Mary Russell and Sherlock Holmes #1)
Unrated
Knave of Diamonds (Mary Russell and Sherlock Holmes #19)
Unrated
Mary Russell and Sherlock Holmes Book 20 (Mary Russell and Sherlock Holmes #20)
⧗ 9.00 / 3


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