The Secret Garden was a science fiction novel by Liu Cixin, which told the story of humans exploring the universe in a future world. The main plot of the story was that a space exploration team composed of humans discovered a mysterious planet in space. There was a base called the "Secret Garden" on the planet. Not only did this base have incredible beautiful scenery and advanced technology, but it also had many mysterious creatures and unknown treasures. The members of the exploration team entered the Secret Garden and began their exploration journey. They found that there were many different kinds of creatures on this planet, some were friendly, some were dangerous. At the same time, they had to face many puzzles and problems that needed to be explored and solved. During the exploration of the Secret Garden, the members of the expedition team gradually discovered their love and determination for space exploration. They decided to continue to explore this mysterious planet to find more treasures and unknown areas to make greater contributions to the future of mankind.