Una copiosa neblina ha atacado la caleta costera en la que vive Agatha (12), evitando que su padre, un humilde pescador, vuelva a casa. Al verse incapaz de cuidarla, su madre la echa. Entonces, Agatha decide prender el antiguo faro para mostrarle a su padre el camino de vuelta. En su travesía, se enfrenta a grandes peligros que con mucho esfuerzo logra sortear. Finalmente prende el faro, iluminando así el camino de los pescadores perdidos.
A copious mist has attacked the coastal cove in which Agatha lives (12), preventing her father, a humble fisherman, from returning home. Unable to take care of her, her mother throws her out. Then, Agatha decides to light the old lighthouse to show her father the way back. In his journey, he faces great dangers that with much effort he manages to overcome. Finally, he lights the lighthouse, thus illuminating the path of the lost fishermen.