A new mystery from the king of mysteries, Keigo Higashino. Until just before its publication, its contents and even the main character of the author's persona were closely guarded, causing a great deal of curiosity among readers. In the end, Detective Matsumiya, a young, elite detective in the Metropolitan Police Department who has appeared in The Newcomer and Wings of the Kirin, takes center stage, leaving readers wondering whether this is a continuation of the Detective Kaga series or the beginning of a new series.

In the process of tracking down the culprit of a murder in Tokyo, the unfortunate past history of two intertwined families is gradually revealed, and the young detective is troubled by their unimaginable bad blood and complicated fates. A troubling film that makes you reflect on the meaning of true family.