In a frozen and wild landscape, Buck, a huge and affectionate dog, lives a life of luxury as a pet in California. However, his world changes dramatically when he is kidnapped and sold as a sled dog in the Yukon during the gold rush of the 1890s. Suddenly, Buck finds himself in the midst of a harsh and brutal environment, where he must learn to survive and adapt to life in the wild. As he faces the adversities of his new reality, Buck discovers his primal instinct and the strength that lies within him.
The story is also intertwined with the life of John Thornton, a kind-hearted gold seeker who becomes Buck's savior. Together, they establish a deep bond, as Thornton shows Buck what love and loyalty truly mean. But the adventure is not without risks, and Buck is forced to fight against other sled dogs, the harshness of the weather, and a strange hunter who wishes to claim him.
The relationship between Buck and Thornton becomes the emotional heart of the story, as both embark on a journey of self-discovery and redemption. Ultimately, Buck must choose between returning to civilization or answering the call of his instinct and the wild life that has always drawn him. It is an epic adventure that explores friendship, freedom, and the connection to nature.