The representative figures of several techniques in mystery novels.

Mystery novels are basically divided into four schools: Ben Gur School in Edogawa, Variant School in Yokogawa, Social School in Matsumoto and New Ben Gur School in Teru Shimada.

Traditional cases mainly imitate murder and Blizzard Villa (that is, Murder in the Chamber of Secrets, impossible crime), while new cases talk about criminals killing and simple narrative techniques, hitchhiking killing.

Narrative skills: I think the best are Roger's Mystery by agatha christie and The Dedication of Suspect X by Keigo Higashino.

Murder in the Chamber of Secrets: agatha christie still recommends it. No one lives, Murder on the Orient Express, Evil Under the Sun and so on. And Ayatsuji Yukito's library series, this kind of mystery novels is the most.

"Indiscriminate homicide" refers to a murder case in which the suspect has no plan in advance, has no enmity with the victim, completely improvises, randomly chooses the target of the crime, and kills whoever he wants. This kind of novel is rare, but I have read Ghost Horse Star's The Palace Spider, in which the first gangster killed people in this way, killing people completely at will.