Broke and burdened with family issues, rock singer Alex (Mathilde Seigner) accepts her friend's job offer to teach a group of retired seniors to sing. What sounds like easy work turns out to be a hot mess when the eccentric old-timers refuse to perform the program's boring kids' songs. All seems lost, until the group proposes a more exciting plan: Alex can teach them rock songs instead. Program director Stephane flat out refuses, but the rebel retirees won't take no for an answer.