This is the second of a really fun Japanese mystery series. Usually I'm not crazy about mysteries where you know who the perp is right from the start, but somehow Higashino makes it work. The suspense comes in seeing if the cops will figure out who the murderer is. They rely on the help of "Detective Galileo," a physics professor, who comes through usually by using his powers of logical thinking. As usual for me in Japanese books, part of the pleasure comes in getting a feel for Japanese society, even though I've never been there. Both this book and the first in the series, "The Devotion of Suspect X" are quite interesting--I recommend the series.