In "The Adventure of the Norwood Builder," a young lawyer, John Hector McFarlane, desperately seeks Sherlock Holmes' help after being accused of murdering Jonas Oldacre, a builder from Norwood. Oldacre had recently changed his will in McFarlane's favor before mysteriously disappearing, and damning evidence emerges against the lawyer. While the police, led by the skeptical Inspector Lestrade, believe they have their man, Holmes notices inconsistencies in the case and uncovers a clever scheme behind Oldacre's disappearance. Using his keen intellect, he exposes a shocking twist and proves McFarlane's innocence.