Sure. The Three-Body Problem is a science fiction novel by Cixin Liu, the first book in the Remembrance of Earth's Past trilogy. The novel is set in China and tells the story of the first contact between humans and an alien civilization.

The story begins in the 1960s, during the Cultural Revolution. Ye Wenjie, a young astrophysicist, witnesses the torture and death of her father, a physicist, at the hands of the Red Guards. She is sent to a labor camp, where she befriends a secret policeman named Shi Qiang. Shi tells Ye about a top-secret government project to contact aliens. Ye is skeptical at first, but she eventually agrees to help Shi.

Ye is sent to a remote military base, where she works on a project to send a signal into space. The signal is intercepted by an alien civilization called Trisolaris, which is on the brink of destruction. The Trisolarans decide to invade Earth, and they send a fleet of ships to our planet.

The novel then jumps to the present day, where a group of scientists are trying to figure out how to stop the Trisolaran invasion. They are led by Wang Miao, a physicist who has been having strange visions. Wang learns about Ye Wenjie and her involvement with the first contact. He also learns about the ETO, a secret society that is dedicated to helping the Trisolarans invade Earth.

The novel ends with a cliffhanger, as the Trisolaran fleet arrives at Earth. The fate of humanity hangs in the balance.

I hope this summary is helpful without giving away too much of the ending. The Three-Body Problem is a complex and thought-provoking novel that explores the themes of science, technology, and the future of humanity. It is a must-read for fans of science fiction.
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