The film chronicles the life of Ritchie Valens, from his early days as a young musician performing in local talent shows in San Fernando Valley, California, to his rise to fame with hits like "La Bamba," "Donna," and "Why Do Fools Fall in Love." The movie also explores his complicated relationship with his half-brother Bob, who feels overshadowed by Ritchie's success, and their mother, Concha, who struggles to keep her family together amidst the challenges of poverty and fame.