★It is a logic practice manual for children written by Yang Zixi, the winner of the Bingxin Prize for New Writing in Children's Literature,
★Humorous and intelligent detective stories allow children to exercise their detective skills and logical thinking ability;
★Multi-faceted puzzle exercises allow children to open their minds and gain joy and confidence after conquering difficulties;
★Professional explanations of logical methods help children to activate their way of thinking and see the world from a wiser perspective.

The series includes 12 titles:
“Treasure of ‘Solomon’”
“The Legend of the Black Cat Chamber”
“The Secret of Monet's Garden”
“The Moon Building and the Nutcracker”
“The Nutcracker and the Music Box”
“The Labyrinth under the Rosebud Mountain”
“The Secret of Chiwu Island”
“Chiwu Island and the Conch Pearl”
“The Secret of the Old Mansion in Ancient Town”
“The Phantom in the Illusion Mansion”
“The Magic in the Illusion Mansion”
“Ghost Ship on the Black Wind Cliff”

Do Mental Exercise and Become a Logical King

After the mystery of the movement of the Nutcracker is solved, Pan Duoduo remembers another strange thing and wants to ask the detective agency to help.

A few months ago, a mysterious person posted a card on the "Moon Building" gate. It is a sentence of words for different parts: “Lift up the black tail and listen. An uncle with a beard is talking”.

Starting from the "uncle with a beard", the group goes to the Nutcracker showroom to investigate, for the Nutcrackers all have big beards. Allen Boe realizes that in order to open his mouth to crush the walnuts, the Nutcracker has a vertical handle on the back, which is like a "tail".

Detectives find a "conductor" Nutcracker whose black dress hem is the handle. The "black tail" may refer to it! There is a small note hidden in the mouth of the "conductor", in which the front side draws a lot of strange patterns composed of large and small rectangles, and the back side draws12 little figures whose movements are twisted and strange, as if they are "dancing"! Everyone thinks of the classic story "The Dancing Figures" from Sherlock Holmes Mysteries...

After analyzing, they realize that the little figures actually represent a piece of music, but do they have to listen to all the hundreds of music boxes in the museum?

When the cleaner is cleaning the furniture, the drawers of an old desk would make a different "strange" sound every time they are opened. Allen Boe notices that the "strange" sounds were la, treble mi, and do... Pan Duoduo also realizes that the strange pattern on the front of the note is the layout of the old desk drawers!

They find the "music desk" with many drawers, and after exploration, a mysterious yellowed "manual" appears in front of everyone...

Yang Zixi

Graduated from the Central Drama Academy in Peking, she has been awarded the Bingxin Children's Literature New Work Award, Qin Wenjun Children's Literature New Work Award, Children's Literature Mudi Award, the Jade Whale Award for the collection of original fantasy children's literature of the “Great White Whale”, the Shanghai Good Work Award for Children's Literature, and the Third Prize of the National Children's Literature Short Story Competition of “Zhouzhuang” Cup.
She has published long fairy tales such as “The Pianist by the Lake” and “No. 39 Star Street”. Her short stories and serialized works have been published in “Children's Literature”, “Children's Literature and Art”, “King of Stories”, and “Fairy Tale Kingdom”.

1.Looking for a Black Tail
2.The Conductor Who Can't Open His Mouth
3.Spooky Little Dancing Man
4.The Old Desk Makes Strange Noises
5.Dead Drawers and Puzzles
6.The Instruction Book with Yellowed Paper