Come On, Explain It to Me

Gu Beichen, you can't solve it. " This was the first sentence the murderer left me. It was written on the title page of an open "Lecture Notes on the Chamber of Secrets", pressed under the hand of the deceased. The deceased was Fang Yuanshan, the best secret room mystery novelist in the country. He died in the secret room he designed, with the door locked, the key in his hand, the windows closed, and the ashes on the windowsill untouched. The murder weapon was a gun made of ice—it melted after being fired. The murderer killed him using the method written in his novel. This is not a taunt. This is an invitation. Since then, I have received a new "handout" every once in a while. Each handout pointed to a new crime method. Psychological manipulation. Perfect poison. Digital crime. Identity forgery. He is not committing a crime. He was in class. And I - am his student. My name is Gu Beichen. Special consultant of the Municipal Bureau's Criminal Investigation Detachment. This book is my class notes. It is also the entire record of the game between me and him. He was going to teach me all the tricks of crime. Then, on the last page, wait for me to catch him with my own hands.