A sequence of short detective stories recounts the famous investigator's reappearance after a prolonged disappearance and the companion's account of subsequent cases. Each episode poses a distinct puzzle—an apparently impossible murder, anonymous ciphered warnings, a private blackmailer, a smashed collection, collegiate intrigue, lost athletic prospects, and a politically sensitive correspondence—and showcases methodical observation, forensic detail, and logical deduction as the team untangles motive and means across varied London settings. The tone blends suspense, clever problem-solving, and human detail.