After losing her father in the sea, Rosa is lodged in the house of the lighthouse keeper João Vidal. António Gaspar, also a lighthouse keeper, loves Rosa. His jealousy of João Vidal will provoke the death of Rosa, an act that the mother of António will help to cover up.

Maneco takes his nephews to spend his holidays at his grandfather's place. But the old scientist discovered a way to travel in time and got lost in the year 1926. Maneco and the boys will try to bring him back.