The Valley of the Moon is a novel by Jack London, published in 1913. It tells the story of Billy and Saxon Roberts, a working-class couple in Oakland, California, during the early 20th century. The novel traces their journey as they struggle with the harsh realities of urban life, including labor unrest, poverty, and personal hardship, before seeking a better life in the countryside.

The story begins in the urban environment of Oakland, where Billy and Saxon struggle to make ends meet. They endure the social unrest of labor strikes, which often turn violent, and personal tragedies such as the death of their child. These hardships lead them to question their place in the world and the meaning of their lives.

Disillusioned with city life, the couple decides to leave Oakland in search of a more fulfilling existence. They embark on a journey through California's countryside, meeting different people and learning about farming and self-sufficiency along the way. Through these experiences, they discover a deep connection to the land and a desire to live in harmony with nature.

Their journey eventually leads them to Sonoma Valley, which they refer to as the "Valley of the Moon," a place they believe will offer the peaceful, prosperous life they have been seeking. Here, they find the land and freedom they long for, and the novel ends on a hopeful note, with Billy and Saxon ready to build a better future together.