Sherlock Holmes pastiches are ten-a-penny, but this is one of the best to appear since Nicholas Meyer’s Gold Dagger-winning The Seven-Per-Cent Solution. Housekeeper Mrs Hudson and Dr Watson’s wife Mary take centre stage as they investigate a case rejected by Holmes, in a story that captures all the atmosphere of 221B Baker Street and Conan Doyle’s London while offering a mischievously fresh take on the great detective.