adamfortuna
This second book in the series builds on the world in a fun way. Similar to the first book, it plays more like a detective novel in a science fiction world. I mentioned it reminds me of Asimov's "Caves of Steel", which is true for this one as well.
The story follows the investigation into a death during a football-like game played by threeps (the robots). I'd put Head on fully in the "fun" category of books. It was immensely entertaining, great at world building and overall just a great ride. As a bonus, the audiobook is read by Wil Wheaton!