As the cover text suggests, there are three strands to this fascinating book: Conan Doyle, Sherlock Holmes, and Victorian London. Of the first two I knew absolutely nothing before reading Close to Holmes, as I'm not a Sherlockian and confess I have never read a Holmes novel; of the third I had some knowledge, being a historian with a broad interest in our capital. However, I finished the book with a much greater knowledge of all three: an understanding of the essentials of Conan Doyle's life and career as it related to London; an introduction to many of the themes, sequences and events in the Holmesian "Canon"; and a vivid sketch of the social, literary and political atmosphere of late nineteenth- and early twentieth-century London.
Alistair Duncan skilfully weaves these strands together as he guides the reader around the capital which Conan Doyle - and Holmes too, in his world - would have known, but he also brings the story up to date with biographical information about the locations involved, what they contained then and what is there now, what is known about them and the factual uncertainties which linger. Pubs, stations and hotels (amongst other locations) are transformed from buildings that we might otherwise pass without thought, into hotspots of history which the curious might pause at and enter. Copious photos and contemporary illustrations accompany the text.
Whilst, not being a Sherlockian, I'm unlikely to use the book to follow Conan Doyle's trail around the capital, Close to Holmes will be invaluable to others wishing to do so. Meanwhile my copy has taken up residence on my bookshelf as a literary quick-reference to Conan Doyle, a taster of what I might expect fictionally if I do eventually take a look into Holmes's world, and a fascinating introduction to London in the late Victorian era.