An action-packed mystery tracing the legendary beginnings of Sherlock Holmes. Don’t miss the premiere of Young Sherlock, streaming March 4 only on Prime Video.
Everyone thinks they know Sherlock Holmes—the brilliant detective of Baker Street, master of deduction, and literary icon whose razor-sharp intellect has captivated readers for more than a century. Created by Arthur Conan Doyle, Holmes has long been portrayed as a man of logic and certainty, capable of unraveling mysteries from the smallest clues.
But what if the world’s greatest detective wasn’t always so sure of himself?
What if, before the legend, there was simply a restless young man still discovering who he was—and who he might become?
That question lies at the heart of Young Sherlock, the new drama series directed by Guy Ritchie and created by writer-producer Matthew Parkhill. The series stars Hero Fiennes Tiffin as a young Sherlock Holmes and Dónal Finn as the equally young James Moriarty. Premiering March 4 on Prime Video, the show reimagines the origin story of one of literature’s most enduring characters.
Rather than focusing on the famous cases that made Holmes legendary, the series explores the formative experiences that shaped his mind, character, and moral compass.
Instead of asking how Sherlock solves a mystery, Young Sherlock asks a more intriguing question: How did he become the man capable of solving them in the first place?
A Mystery That Changes Everything
At the center of the story is a murder case that places the young Sherlock himself under suspicion—threatening not only his reputation but also his freedom.
For the first time, he is forced to confront danger not as a detached observer, but as someone directly entangled in the consequences.
“A lot of people know what they expect from Sherlock Holmes,” says Hero Fiennes Tiffin. “And we’ve got to give them just enough, but keep them hungry for more.”
The Reckless Years
Traditionally portrayed as emotionally distant and fully formed, Sherlock in this series is still navigating the uncertainty and impulsiveness of youth.
Matthew Parkhill found inspiration in the unexplored gaps of the detective’s backstory.
“I was fascinated by the question of what made Sherlock the man he is, and what his younger life might have been like,” he explains.
One intriguing line from Arthur Conan Doyle’s original stories helped shape that idea. Holmes once confides to Dr. Watson:
“You know, Watson, I don’t mind confessing to you that I have always had an idea that I would have made a highly efficient criminal.”
That thought reframes the detective entirely.
“What if Sherlock had been a bit of a live wire?” Parkhill asks. “Someone who got into scrapes and trouble in his younger life? What if that’s part of what helps him understand the criminal mind so well?”
The result is a version of Sherlock who is brilliant but impulsive—principled yet still forming his worldview. His proximity to danger, and even to wrongdoing, becomes part of the process that sharpens his understanding of justice.
A Rivalry Begins
Another crucial piece of Sherlock’s journey is his relationship with Moriarty.
In Young Sherlock, Moriarty is not yet the infamous criminal mastermind fans know. Instead, he emerges as a powerful influence during Sherlock’s formative years—a philosophical rival whose ideas challenge Sherlock’s evolving sense of right and wrong.
“If Sherlock is this great moral compass,” says Dónal Finn, “then Moriarty becomes the antithesis to that. Through him, we see the influences that shape who Sherlock ultimately becomes.”
The Making of a Legend
By grounding Sherlock in vulnerability, moral conflict, and youthful uncertainty, Young Sherlock offers a fresh perspective on a character audiences think they already know.
It invites viewers to witness the birth of a legend—not at the height of his genius, but at the moment he begins to discover it.
All eight episodes of Young Sherlock premiere March 4 exclusively on Prime Video.
