Took much too long to get to a disappointing denouement. I did enjoy the characters for the most part, but I wished they weren't so introspective and cautious. If everyone had been a little more forthright, we could have settled all this in half the pages. (When I enjoy a book, I don't care how long it is, but when I'm mostly driven by the need to get to the solution of the puzzle, I can do without some of the atmosphere.) But it was set in Venice, which was described beautifully, so it gets at least one star for that.