compare these two Janapese novelists both of them are good at writing detective novels both of them are welcomed by comtemporary readers to me, i like them both, for each of them has their individual interest and concern while 宮部 tends to depict younger children (usually are boys and girls) and social issues, 伊坂 shows his talent on complex narrative structure and deliberately confusing time consequence. however in this novel i read for the first time 宮部's attempt to play a game with the readers. that is, she constructs her story as RPG game which means Role Play Game. the combination of the plot and the narrative form is so smart that I could not help but reading this novel for several times. Also located the story in very limited locus, 宮部shows us her ability to say what she means to say in long dialogues instead of exciting actions. anyway, i enjoy reading this novel very much and it is possibily the most interesting one recently.