★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

A fourth grade girl, Pan Duoduo, approaches a detective agency and commissions them to conduct an investigation at a music box museum.

The private museum, run by Pan Duoduo’s grandfather, is located in a century-old building inherited by the family and exhibits music boxes from all over the world and different eras. The building is called the "Moon Building" because it is white and looks like a curved moon when viewed from above.

There is a Nutcracker exhibition hall on the second floor of the Moon Building, which not only displays music boxes with Nutcracker elements, but also a 1.4-meter-high large Nutcracker ornament. Pan Duoduo says that the big Nutcracker can move by itself! One day, it inexplicably disappeared from the second floor and appeared on the courtyard lawn!

The little detectives go to the "Moon Building" to investigate and find that the Nutcracker is hollow and there is no walking mechanism inside. In the second floor of the showroom where the Nutcracker has been placed, Allen Boe finds that the window width is just enough to allow the Nutcracker to pass through, but the wisteria trellis under the window which has no difference let him disprove his hypothesis: if the Nutcracker is transported down from the window, it must damage the dense wisteria.

Careful Allen Boe soon discovers a new clue: There were two expanded bolts under the window sill, with rust on the bolts that has been faked with paint! Do they have anything to do with the movement of the Great Nutcracker?

Li Sidi sees the slide at the amusement park and she is inspired with an idea for an investigation. After investigating, the little detectives finally reveal the secret of the Nutcracker’s movement downstairs! What secret is hidden behind this bizarre incident?

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 Nutcracker Goes Downstairs by Himself
2.Investigating in the Music Box Museum
3.The Incredible Chamber in the Sky
4.Someone Told a Lie
5.Decryption Inspired by the “Slide”
6.A Poignant Motive for the Crime