The film follows two teenage boys, Tenoch (Diego Luna) and Julio (Gael García Bernal), who embark on a spontaneous road trip to a fictional beach called Heaven’s Mouth. They are accompanied by Luisa, an older Spanish woman seeking an escape from her own heartbreak. While the surface narrative is driven by adolescent hormones and competitive bravado, the film’s soul lies in the "unseen" moments—the narrator’s voice-overs that explain the tragic histories of the towns they pass and the social inequality visible just outside their car windows.