Unwed Glenda Vaillot has been fighting for the custody of her son, Norbert since the day he was born, three years ago. The parents of Norbert's father, now deceased, want custody of their grandson, trying to exploit the fact that Glenda is hearing impaired. With the complicity of a disbarred lawyer they take advantage of the confusion of a Christmas parade and kidnap the boy.

But unwavering motherly love and the resolve of fighting against all odds drive enraged Glenda to hunt down the kidnappers. She is helped by Zufolo, a service dog trained to alert her of the most important sounds. Will she make it against fraud and evil?