This is the third and (theoretically) final book in the John Pilate series. Honestly, while it was still a very good read, it felt like the author was growing tired of his protagonist.
In this book, John Pilate is on tour to promote his book about the Cross College conspiracy (discussed in book #1, Pilate's Cross). His wife, Kate, is expecting their first child, and things seem to be on an even keel.
Except, of course, for the threatening phone calls -- from a man who everyone (with the possible exception of John Pilate) thinks is dead. Pilate's alter-ego, Simon, thinks Pilate's really losing it -- and that's something, coming from an imaginary rat.
Once again, we've got action and thrills a-plenty, and the writing is top-notch. I enjoyed the book, but just didn't like it as much as I did the previous two.