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The second episode of Sherlock Season 4, titled "," is widely regarded as a return to form for the series, blending psychological depth with a chilling, contemporary villain. The Architect of Evil
The episode introduces (portrayed by Toby Jones ), a billionaire philanthropist who uses his immense wealth and public status to hide a secret life as a serial killer. Smith’s character is a modern adaptation of the villain from Sir Arthur Conan Doyle’s "The Adventure of the Dying Detective," but with a disturbing real-world inspiration—the British media figure Jimmy Savile . Smith’s primary weapon is his "memory-erasing" drug, which allows him to confess his crimes to others and then force them to forget. A Study in Grief
: Struggling with severe PTSD and grief, John experiences vivid hallucinations of Mary, using her as an internal dialogue to process his anger and loss.