Set in the urban landscape of Spokane, Washington, Under the Bridge centers around two brothers, Tate and Indy. The story begins under a local bridge, the brothers' refuge, where they skateboard. Indy, the younger brother, exhibits a remarkable talent for the sport and a unique intelligence, though he harbors a strong distaste for formal education. His ongoing conflict with their father leads him to make the drastic decision to drop out of school.
As Indy distances himself from his previous life, he is drawn into the darker side of Spokane. He begins associating with a dangerous crowd, neglecting his skateboarding and landing on a dangerous path that exposes him to the city's criminal elements.
In the meantime, Tate grapples with the aftermath of Indy's decisions. Struggling with his sense of responsibility and guilt, Tate eventually decides to act, driven by his deep love for his brother. He embarks on a perilous journey to save Indy from his dangerous lifestyle and bring him back home.
Throughout Tate's journey, he confronts numerous challenges. He encounters the dangerous underworld of Spokane, deals with the complexity of his fragmented family, and battles inner turmoil. His journey reveals his strength and courage, all underlined by his unwavering dedication to his brother.
The narrative reaches its peak when Tate finally gets through to Indy, leading to a deeply emotional confrontation between the brothers. Despite the ensuing conflict, their bond prevails, reminding Indy of what he is at risk of losing.
In the resolution, Tate's efforts pay off. Indy chooses to return home, mend his relationship with their father, and return to school. He also returns to his passion, including skateboarding under the bridge, thus reestablishing himself as the best skateboarder in Spokane and rekindling the joy it brings him.
