★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

On the weekend, Li Sidi leads the members of the Detective Agency to a remote ancient town. Her business parents have bought a century-old mansion and they intend to transform it into a Chinese-style hotel, so she invites them to experience it.

After arrival, the group tours the old mansion and stumbles upon a carved window in the Qingliang Pavilion with two odd symbols - the oracle bone characters for "fire" and "cloud". Later, they go to the room called "Yanan Hall" to listen to Mr. Carl playing the piano. Alan Boe finds another strange symbol on the alabaster flower pot - "pine" in gold script. Later, in the room called "Mianzhu Hall", the detectives find the oracle bone character for "light" in a Western clock. In the master bedroom, Mr. Carl finds a symbol that looks like horsetail whisk on a scroll.

Li Sidi, who is good at poetry, combines the information and catches a clue - they are likely to be related to a poem by a certain Chinese emperor of the Song Dynasty!

Through the poem, the group finds a mysterious embroidered fan and pinpoints the pavilion in the old mansion's garden, and they finally discover a Pi Xiu incense burner. They analyze the hints on the incense burner, and focus the clues on a black lacquer cabinet, which is a small chest of drawers with "Hundred Sons Picture" inlaid with inlays on the surface.

After careful observation and reasoning, Alan Boe finds that there is a secret compartment in the cabinet!

A small wooden box has been hidden in the mezzanine for decades, and the truth in it is waiting to be unveiled by people…

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. The Century-old Mansion Deep in the Ancient Town
2. Fire and Clouds on the Cool Pavilion
3. Strange Symbols Scattered Everywhere
4. Landscape with Superimposed Fantasy and Reality
5. The Best Autumn
6. Hidden Warmth for More Than Ten Years