This is the third in the "Murder Rooms" series (although readers will search in vain for that phrase appearing anywhere in the book's title/jacket or text) concerning the adventures of a young Arthur Conan Doyle and his mentor/Sherlock Holmes model Dr. Joseph Bell, and it is every bit as mesmerizing as the first two (The Patient's Eyes, The Night Calls), perhaps even more so. This new work, however, goes beyond being simply (simply?) a fascinating murder yarn, as it begins to more closely develop the character of Doyle into the real-life Doyle who could, and would, of course, write the Holmes stories. For here we finally pin-point Doyle & Bell's arch-nemesis the (real-life) serial killer Thomas Neill Cream as the template for Professor Moriarty.
Of course, there is no real basis of fact in the battle between Doyle, Bell, and Cream (whom some believe-inaccurately-to have potential as "Jack the Ripper"), but they WERE contemporaries. There paths COULD have crossed. And, anyway, when the story is this damn' good; the characters so gripping; and the atmosphere so haunting, who cares?
A word of caution: Although the book works perfectly well as a stand-alone, enjoyment will be multiplied 10 fold if you read the others in the series, in order, first. And why on earth wouldn't you? They're great! (pace Tony)