Alejandro and his loyal best friend Canicas are hardworking mariachi singers looking for fame in Mexico City. More than just a mariachi, Alejandro has a second full time job - he's a single dad. When Alejandro tries to secure a visa for his young daughter to visit her grandparents in the U.S., his request is flatly denied by a young embassy worker, Rachel. Later that evening, Alejandro and Canicas run into Rachel while playing a gig - which turns out to be a celebration of her promotion to a post in London. Alejandro seizes the coincidental encounter as a chance to change her mind on his rejected visa, and with Canicas by his side, they whisk her into an unforgettable adventure. And, while he gets busy pulling strings for a visa, it turns out the strings of his heart are pulled too.