The set of a Sherlock Holmes film is disrupted by a murder even the great detective would find hard to solve.’Delightful … A surprise on every page’ NEW YORK TIMESThe Baker Street Irregulars are a group of Sherlock Holmes experts, and when they get word that a Hollywood studio has plans to produce a tough, hard-boiled interpretation of the Great Detective, written by an author who dislikes both the group and Conan Doyle’s original work, they make their feelings abundantly clear.To placate them, the studio invites them to visit the set. But as soon as they arrive, things start to get strange. There are a series of ominous warnings, each one referencing one of Holmes’s famous cases, warnings which are soon followed by murder …