This novel is a satirical science fiction tale that transports the reader to Mars, where the protagonist, a Chinese man, finds himself stranded in a society inhabited by cat-like humanoids. The narrative delves into the peculiarities and dysfunctions of this Martian civilization, known as Cat Country, highlighting its inhabitants' indolence, corruption, and societal decay. Through the lens of this alien society, the author critiques various aspects of early 20th-century Chinese society, politics, and culture, using the allegorical Cat Country to reflect on human follies, the dangers of political apathy, and the consequences of societal neglect. The story is both a unique exploration of extraterrestrial life and a poignant commentary on the human condition.

The novel revolves around the protagonist, Fang Hongjian, who returns to China after failing to complete his studies in Europe. He fakes a doctoral degree to secure a teaching position and navigates through a series of comedic yet poignant social and romantic entanglements. Set against the backdrop of the tumultuous 1930s China, the story uses sharp wit and satire to explore the absurdities and complexities of traditional and modern Chinese society, as well as the human condition, through the lens of marriage, education, and familial expectations. The title metaphorically compares life and marriage to a fortress that is simultaneously under siege and difficult to escape from.