Ep 3. The Final Problem

The episode "The Final Problem" of Sherlock Season 4 is an intense and thrilling journey that sees Sherlock and his companions pushed to their limits as they face off against one of the most dangerous foes they've ever encountered.

The episode begins with Sherlock receiving a cryptic message from an unknown source, which leads him and John to visit his estranged sister, Eurus, who has been locked away in a heavily guarded facility for years. Eurus is a brilliant and manipulative mastermind who possesses incredible intelligence and has a deep-seated desire to solve puzzles and test the minds of those who come into contact with her.

As the trio delve deeper into a series of escalating puzzles that seem to be leading them towards some kind of final solution, they find themselves in a race against time to figure out Eurus's endgame and prevent her from causing untold destruction.

Throughout the episode, viewers are treated to an immersive and edge-of-the-seat experience full of plot twists, suspenseful set-pieces, and emotionally charged character moments. As their investigation progresses, Sherlock, John, and Mycroft must confront painful truths about their past and confront deep-seated traumas that threaten to tear them apart.

One of the standout elements of this episode is the performance of Sian Brooke as Eurus. She delivers an incredibly nuanced and terrifying portrayal of a character who is both sympathetic and chilling all at once. Her exchanges with Sherlock are incredibly tense and suggestive, as they explore their shared history and the psychological scars that have shaped them into the people they are today.

There are also several memorable set-pieces throughout the episode, including a tense standoff in a flooded room that tests the limits of the characters' resourcefulness and courage. The episode also features fascinating uses of technology and psychological manipulation, which echo contemporary concerns about the role of these elements in our society and the power they can wield over us.

Overall, "The Final Problem" is a standout episode of Sherlock that delivers a thrilling and emotionally resonant story that will keep viewers on the edge of their seats from start to finish. With excellent performances, stunning set-pieces, and a deeply satisfying conclusion that pays off on several seasons of character development and story arcs, this episode is a must-watch for fans of the show and anyone who loves a well-crafted mystery.