The Lion's Game, by Nelson DeMille

The Lion's Game is a follow-up to Plum Island and features Detective John Corey again.  I liked the structure of the plot which was a cat-and-mouse chase theme.  John Corey and the antagonist were well developed by giving the reader their inner thoughts and motivations.  My only real beef with the book is that the ending was unresolved, apparently to set up a sequel, The Lion, published ten years later in 2010.