Amazon MGM Studios has long been at the forefront of adapting beloved literary works for modern audiences, and their latest foray into the world of Sir Arthur Conan Doyle’s Sherlock Holmes is no exception. The character of Sherlock Holmes, a fixture in detective fiction since the late nineteenth century, continues to inspire creative reinterpretations, and the new Prime Video series "Young Sherlock" is the latest to capture the public’s imagination. But as much as the show’s premise—a 19-year-old Holmes paired not with Dr. John Watson, but with his future nemesis James Moriarty—has intrigued viewers, much of the buzz has centered around the actor behind Moriarty: Dónal Finn.
Dónal Finn’s journey to this breakout role hasn’t been a straight shot. Before he was dazzling audiences as the devilishly charismatic Moriarty, Finn was best known for stepping into the shoes of Mat Cauthon in Amazon’s ambitious adaptation of Robert Jordan’s epic fantasy saga, The Wheel of Time. When Finn replaced Barney Harris as Mat in the show’s second season, he faced the daunting task of winning over both newcomers and passionate fans of the books. According to reporting from el-balad.com, Finn’s take on the mischievous farm boy with a destiny left a strong impression, helping to anchor the series as it evolved over its three-season run.
Yet, despite a committed cast and a story with decades of lore behind it, The Wheel of Time series met an abrupt end. Amazon MGM Studios canceled the show after three seasons, a decision that left fans disheartened and, in many cases, outright crushed. As el-balad.com noted, the cancellation cut short Finn’s arc as Mat Cauthon—a character whose journey in the books is both complex and central to the larger saga. For many viewers, the sudden end felt like a missed opportunity to see Finn’s portrayal fully blossom.
The roots of this disappointment run deep. Robert Jordan’s The Wheel of Time novels, beginning with The Eye of the World in 1990, have long been a cornerstone of American fantasy literature. Jordan completed 11 novels before his death in 2007, and his work was finished by Brandon Sanderson, who used Jordan’s extensive notes to bring the saga to its epic conclusion. The books have inspired a dedicated fan convention, JordanCon, and have often been compared to other fantasy juggernauts for their intricate world-building and sprawling cast of characters.
Translating such a vast literary universe to the screen was always going to be a gamble. The adaptation, greenlit by Amazon MGM Studios and helmed by Rafe Judkins, was initially considered a risky proposition—especially in the shadow of Amazon’s own high-budget project, The Lord of the Rings: The Rings of Power. Concerns about budget and production values loomed large, and the show’s niche appeal meant it was under constant scrutiny. While some viewers felt the first season struggled to capture the full magic of the books, the series gradually gained traction. The authenticity brought by cast members like Rosamund Pike helped ground the adaptation, and Finn’s arrival in season two injected fresh energy into the ensemble.
Despite these strengths, the reality of high production costs and the challenge of condensing such a rich tapestry of lore into episodic television proved insurmountable. As el-balad.com reported, the sense among viewers was that the series deserved more time to unfold. The abrupt cancellation left many feeling that Mat Cauthon’s journey—and by extension, Finn’s performance—had been cut off just as it was coming into its own.
In the wake of The Wheel of Time’s cancellation, Finn’s career took a new turn. His casting as James Moriarty in "Young Sherlock" marked a significant shift, both in genre and in the kinds of roles he was being offered. The new series, available on Prime Video, reinvents the classic Holmes-Moriarty dynamic by making them youthful contemporaries rather than bitter adult rivals. Hero Fiennes Tiffin stars as the young Holmes, but it’s Finn’s portrayal of Moriarty that has drawn particular praise. Critics have described his performance as “devilishly charismatic,” and viewers have responded enthusiastically to the fresh dynamic he brings to the screen.
According to Amazon MGM Studios, the decision to pair Holmes with Moriarty, rather than the traditional Dr. Watson, was a deliberate attempt to shake up the well-worn buddy-detective formula. The result is a series that feels both familiar and new, with Finn’s Moriarty providing a compelling foil for Tiffin’s Holmes. The chemistry between the two leads has been cited as one of the show’s major strengths, and Finn’s ability to inhabit the role of a future villain while maintaining a sense of charm and wit has not gone unnoticed.
The impact of Finn’s performance in "Young Sherlock" is magnified by the context of his recent career arc. As industry observers have noted, Finn’s rapid rise—from a supporting role in a canceled fantasy series to a headline-grabbing part in a high-profile detective drama—has reshaped expectations about his trajectory in the entertainment world. For fans still mourning the loss of The Wheel of Time, his success in "Young Sherlock" offers a measure of consolation and a new reason to tune in.
Meanwhile, the legacy of The Wheel of Time continues to loom large. The novels remain a touchstone for fantasy enthusiasts, and for those who found the adaptation wanting, the books offer a chance to experience the story in its fullest form. As one reviewer put it, the best way to appreciate Jordan’s world is still to dive into the novels themselves.
For Dónal Finn, the future looks bright. With his performance in "Young Sherlock" earning rave reviews and his name now firmly on the radar of both fans and industry insiders, he stands at the cusp of what could be a defining period in his career. Whether he continues in the world of detective fiction or returns to fantasy, audiences will be watching closely to see what he does next.
In a landscape crowded with adaptations and reboots, Finn’s journey is a reminder that even when one story ends too soon, another may be just beginning. And sometimes, it’s the unexpected turns that make an actor’s career—and a viewer’s experience—all the more memorable.