Pilar received two gifts for her birthday: a pair of dancing shoes, and a little white puppy, named Paco after her favorite uncle. Pilar loves Paco, even more than she loves dancing to the beat of her Tio Paco's drum. And Paco loves to dance with Pilar. But Pilar starts to notice that when the sun goes down, Paco never wants to dance. All he does is lie around and howl at the moon. "He's in love," says Chachi, Tio Paco's new girlfriend. "With whom?" everyone wonders. But Pilar has a suspicion, and she has a plan. And on her birthday, she and her family are going to make Paco's wish come true.