The book is told in the first person by John Taylor, a private investigator in London. Taylor has an interesting background: he was born and raised in "the Nightside". As described on the back cover, the Nightside is a "square mile of Hell in the middle of the city, where it's always three AM. Where you can walk beside myths and drink with monsters. Where nothing is what it seems and everything is possible. A region that, although supposedly in the middle of London, actually appears to be larger than London itself." The description is not metaphorical. The Nightside, and other realms like it, are meeting points for people and beings of all time periods, worlds, and realities. It's visited by gods, demons, and everything in between. A person visiting the Nightside may find genuine miracles, or he may meet a grisly fate. Taylor left the Nightside several years ago and swore never to return. But now he has bills to pay and a wealthy woman in distress wants to hire him to find her runaway daughter.
Once in the Nightside, we find out several things about John Taylor. First, Taylor was effectively orphaned after his mother left and his father drank himself to death. Second, his father drank himself to death after finding out that his wife (Taylor's mother) wasn't actually human. Third, like many born in the Nightside, Taylor has a supernatural gift; he is able to find almost anything. Fourth, despite his kindness and loyalty, most Nightside residents are absolutely terrified of John Taylor. This last aspect remains a mystery throughout the book. I can only assume the author further elaborates the reasons for this in the sequels (the 10th book in the series was released just this year).
The book moves quickly and introduces a number of interesting secondary characters. By far, my favorite secondary character is Razor Eddie. Eddie was a high-priced assassin for hire until he had a strange experience. As described in the book:
"Something happened to him on the Street of the Gods, something he still won't talk about, and when he came back it was as something both more and less than human. Now he sleeps in doorways, lives on handouts and eats leftovers, and wanders where he will, living a life of violent penance for his earlier sins. His chosen victims tend to be the bad guys no-one else can touch. The ones who think they're protected from the consequences of their actions by money or power. They tend to end up being found dead in mysterious, upsetting ways. And that's Razor Eddie; an extremely disturbing agent for the good. The good didn't get a say in the matter."John Taylor himself is an appealing protagonist: mysterious (despite the fact that he's the narrator), resourceful, and loyal to the point of ignoring his instincts of self preservation. The Nightside itself even takes on a character of its own, albeit a schizophrenic one. Now that I think about it, the nominal plot of the book (i.e., the search for the runaway) seems more like a reason to introduce the Nightside and its odd roster of characters. However, Green's Nightside is such a fascinating place that I look forward to reading the sequels.