A puzzling death linked to a railway viaduct near a country golf club draws local men into a methodical inquiry that uses timetables, maps, and testimonies to reconstruct events. The narrative moves from clubrooms and parish life to inquests, searches, and a fog-shrouded pursuit, as investigators test hypotheses, follow misleading clues, and assemble evidence through practical experiments. Episodes pivot on clever little puzzles—a revealing photograph, a communicative book—and on temperate philosophical asides, while dry humor and social detail frame the procedural unraveling leading to a final demonstration of how the crime was committed.