The quietly dignified Don Plutarco, his son Genaro and grandson Lucio make a humble living as travelling musicians. They also collect supplies and ammunition for the guerrilla movement that has arisen in response to the tyrannical regime. Upon returning to their hometown after one journey, they find it has been occupied by the army and their fellow villagers have been forced into hiding. Genaro leaves to find a way to salvage the supplies. Meanwhile, unbeknownst to his son, Plutarco attempts to recover the ammunition himself and courageously approaches the squad captain.