Domestic mystery Forensic Files of Koharu 久龍, a Small Mathematician and Secret Keys / Genki Shindo

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Domestic Mystery
『 This "Miss 』 Grand Prize Series" / "The Front-Line Police Forensics Mystery" by the author who is a former forensic researcher! Kumagai, a member of the special investigation team, heads to a nursing home that was almost completely burnt down, and along with Koharu, a forensic researcher, investigates the cause of the fire. Then, it was found that it was accidental fire caused by a cigarette, and it was the missing boy Nozoki who killed the cigarette. The suicide note he wrote was also found. However, Koharu, who assumed that Nozoki was alive, continued the investigation with Kumagai. The 22nd 『 This "Miss 』 Grand Prize" hidden gem work.