It focuses on Detective Milo Sturgis and his best friend-cum-psychologist-cum-confidante, Alex Delaware. It sees them investigate a guy who seems to "borrow" high end luxury cars (Bentleys, Rolls Royces, Lexuses and the like) to commit murder, before returning them to their owners with a clue inside. It's the clue that's left in a "borrowed" Bentley on their patch that sees Sturgis and Delaware being called in.
The problem is that the reasoning the psychopath uses to commit these murders is so far beyond belief that it's gone so far beyond the "belief horizon" that it's come up behind you. In addition, it's more than a little tacky if I'm honest. I won't go into details, just in case you don't believe me and actually decide to read this book, but I actually felt a little dirty for reading it, which isn't something that happens to me that often!