1. The Legend of the Hound: The story begins with the chilling legend of a monstrous hound, said to be the curse of the Baskerville family. This thread initially seems like a mere folklore, but it soon becomes clear that it holds a sinister truth, linking to the current events and the recent deaths.
2. The Mysterious Death of Sir Charles: The sudden death of Sir Charles, the head of the Baskerville family, fuels the initial fear and suspicion. The initial assumption of a heart attack is challenged by the presence of a large, mysterious footprint and the eerie story of Sir Charles's terror before his death. This thread drives the investigation and sets the stage for Holmes and Watson's arrival.
3. The Strange Behavior of Stapleton: The enigmatic character of Stapleton, a seemingly harmless naturalist living near Baskerville Hall, is initially presented as a friendly neighbor. However, his actions, particularly his interest in the legend of the hound and his knowledge of Sir Charles's death, raise doubts about his true intentions. This thread leads to his eventual unmasking as the perpetrator.
These three seemingly separate threads converge as Holmes unravels the mystery. The legend, the death, and Stapleton's behavior are all connected by the sinister plan to inherit the Baskerville estate through murder. Solving the puzzle involves bringing these threads together, culminating in the unveiling of the true nature of the hound and Stapleton's motives.