As per the rest of the series, Treachery has a very nice balance of mystery, action, and historical background. Bruno as the lead continues to be a compelling character to follow as he attempts to unravel the mysteries in question throughout this entry. He is generally wise, kind, and quick to act in the face of danger but is not a character without flaw. There is just enough historical background(with the story somewhat centered around Sir Francis Drake) to be interesting without bogging the story down. If the book has a weak spot, it"s simply that the reader will miss some detail if they haven"t read the previous books in the series, though the book is easy to pick up as a stand-alone as well. Looking forward to the next one.