For a start, it is very deliberately a post-9/11 thriller, in which a man bereaved by the loss of his wife and children in the Twin Towers sets out to wreak what he thinks of as a sacrificial vengeance on the city by becoming a serial terrorist himself. For another, Block, who wrote some pornography early in his career, has created a female character whose kinky sex antics will definitely ruffle some of his mainstream readers. Block's intimate knowledge of New York and its folkways--and of urban character and conversation--has always been one of his great strengths and is on plentiful show again here. The novel offers a very crowded canvas whose central characters are the sad figure of the terrorist himself; a former police commissioner who eventually sets out to bring him down; a midlist writer who suddenly gets to be a hot property when he's accused of a murder (the publishing scenes will be delightful for insiders); the aforementioned kinky lady, an art dealer when not playing pierced dominatrix; a gay recovering alcoholic who unwittingly leads the villain to the scenes of his crimes; and, of course, the city itself, which, as the title suggests, is a place where everyone is somehow connected to everyone else's business.