James Ryder is a fictional character from the short story "The Adventure of the Blue Carbuncle," written by Arthur Conan Doyle. He is depicted as a man who becomes embroiled in a crime involving a valuable gemstone, the Blue Carbuncle. Ryder's actions and motivations drive the plot, showcasing themes of guilt and redemption. In the story, Ryder's character is revealed through his interactions with Sherlock Holmes and Dr. John Watson. His attempts to evade responsibility for his actions highlight the moral dilemmas faced by individuals when confronted with the consequences of their choices.