An interesting read, though not quite as taut as some of his recent work. The end wasn't built up to as well and didn't have as good an ending as Angels & Demons, for example.

I was a bit put off that I actually immediately guessed the mathematical meaning and artistic reference of "1514" when it was brought up as a clue within the plot. Perhaps I need to lay off playing around so much in the worlds of combinatorics and woodcuts?