Two people die in hot spring towns in different parts of Japan from hydrogen sulfide poisoning. Investigating the case is geochemist Shusuke Aoe, who witnessed the same mysterious girl, Madoka, at both crime scenes A science fiction mystery novel that challenges established norms of the genre, written by acclaimed author Keigo Higashino!

Language: English
Page Count: 356
Size (in inches): 5 x 8
Creator(s): Keigo Higashino
On-Sale Date: October 14, 2026