London turns into a mystery the moment Sherlock Holmes appears: a city of fog and gas lamps, of respectable clubs and shadowy docks. A change of perspective is all it takes for the map to fill with meaning. Walk its streets, stations, hotels and theatres, and follow the river through a geography of shadows.

Here you will find all four of Conan Doyle’s novels: A Study in Scarlet, The Sign of Four, The Hound of the Baskervilles and The Valley of Fear. Step into the library at Baker Street, tune your ear to the music that fills the sitting room, learn the secrets of baritsu and scour the day’s papers for headlines, advertisements and rumours. And, of course, you will find a detailed list of every case, his own and others’, that passes through the hands of the consulting detective.

The slipcase includes a large paper map of the locations in the novels and access to an interactive map with period images, notes and geolocation tools, as well as the e-books of the novels in the original English. Everything you need to walk alongside Holmes and Watson: because in London any corner could be a clue, and any detail the solution.

The game is afoot!