This is one of my favorite series of books, hands down.  Generally, I get tired of a series after a while. The plots all start to blend together and the characters stop progressing.  Agent Pendergast is such an enigma, I troll through every book looking for more details on his personality, his motivations, any hint of a crack in his iron clad self control.  Each book offers a tiny bit more...

That being said, I have always felt sorry for Constance's unrequited love for Pendergast.  She has her own dark side, her own issues to work through.  I was glad to see more involvement from her in the mystery and in the book in general.  Preston and Child keep me coming back, over and over and over again.  Well played!