This started brilliantly and fizzled out towards the end, with its convoluted plot and twists. When the killer was caught and jailed, only halfway through the book, I had this sinking feeling that this was not going to end well.
Why, oh why, did he have to add so many unnecessary twists. There were a whole series of twists that had no 'Rhyme' or reason. Well, there was some complicated reason, which was laughable. This was an entangled mess.
However ignoring the plot, I did enjoy learning so much from this book. Many reviewers complained about too much details on the detective procedural, but this is the only part that I liked in this book.
Jeffrey Deaver's books usually have good amount of details on police procedural. Information on tattooing in 'the Skin Collector', Art of interrogation and Kinesics in 'The Sleeping Doll', detailing of forensics not only to identify the criminal, but to track his movements and predict his next moves in 'The Coffin Dancer' and 'The Cold Moon', Electricity and alternate power sources in 'The Burning Wire', negotiating skills, the world of hearing impaired, the history of sign language in 'The Maiden's Grave', Document examination in the 'Devil's Teardrop' (though this was my least favorite), Germany's black market and political scenario during WW2 in 'Garden of Beasts', Game theory and shepherding in 'The Edge'.
This book too gives an amazing insight into the world of magicians- The types of illusion, escape artists, protean (quick change) magic, popular illusionists and their techniques, animal tricks, mentalism, picking locks(scrubbing). The way Kara explained all these illusions by actual demonstration was like watching a movie.
Then the information about the tools used for forensics- microscope, gas chromatograph, mass spectrometer etc, some info on sergeant assessment, references to famous NYPD detectives, their techniques (The NYPD Head in 1880s, Thomas Brynes once broke a major theft ring by tracing a tiny fiber found at a crime scene). Rhyme's way of methodically writing all the inputs from the crime scene, to profile the 'UNSUB' is simply brilliant. These techniques (walking the grid, displaying all the findings on a large board) are repeated in all books of Rhyme series, so it doesn't matter even if we don't read the books in the published order.