Tomas is too much for his lone mother so she sends him to live with his older brother Federico in Mexico City. Tomás has brought a cassette along with him; the tape is part of his father's legacy and contains the music of Epigmenio Cruz. They say his songs moved Bob Dylan to tears, and that he could have saved Mexico's rock music scene from ruin. When the trio learns that their idol is in hospital fading fast and alone, they set off in their rusty heap of a car to pay their last respects to this one-time rock star. What they thought would be a simple trip to find their childhood idol, soon becomes a voyage of self-discovery across Mexico City's invisible frontiers.