Sherlock Holmes, the most well-known character of the detective novel, works in a very precise historical and geographical world: Victorian England. His adventures chronicle a golden age in which the detective preserves the established social order. In parallel, the properties of space play an essential part in the action that leads to the solving of mysteries. Here, the climate plays a double role: it faithfully translates the British weather to create the atmosphere of adventure; and it generates extreme meteorological events that help solve numerous enigmas. In this context, smog contributes to the "Holmesian" mythology and to the safety of the murderers too.