2Week

Next, it investigated about "Knox's Ten Commandments" as which the rule at the time of writing a detective story is described.

"Knox's Ten Commandments" is a rule at the time of writing the detective story which Ronald Knox announced.

Although it is a famous rule and has been a basic indicator to those who are initiated into a detective story along with Van Dine's 20 rules, many works which broke this Ten Commandments intentionally also exist.
In Japan, Rampo Edogawa is introducing in a "vision castle."

1.The criminal has to appear at the beginning of a tale.
2.Don't use supernature capability for the detective method.
3.Two secret secret passage and passages or more must not be       located in the scene of the crime.
4.Don't use for a crime undiscovered poison and the machine which requires difficult scientific explanation.
5.Don't make Chinese people appear.
6.The detective must not solve an incident by chance and six sense.
7.Except for the case where disguise oneself and characters are deceived, the detective itself must not be a criminal.
8.Don't solve a detective according to the key which has not been shown to readers.
9."The role of Watson" must tell readers about all judgment of it.
10.Twins and a double role must be beforehand told to readers.

But various mystery novel writer broken this rule. Why? I think 
change day more and more influence on mystery novels. So I can understand this tendency.
 
I was surprised that knew this rule, and I think that myatery novels writer is sharp. Because they can make many stories. And they saved this rule, It is very difficult thing. My attension is engaged by another genre book. If I have had chance, I will examine another genre book.

I am looking forword to read more interesting novels.