Two island-born siblings spend their days exploring a rocky bay and helping maintain the family lighthouse, accompanied by a faithful donkey, an old sailor companion, and a talkative pet crow. Episodes range from practical tasks such as hauling oil and managing rails to small-scale adventures — fog-bound dangers, a rescue, a missing white slipper, and lively picnics — that reveal childhood curiosity and common-sense bravery. Scenes alternate playful humor, domestic detail, and warm descriptions of coastal nature, emphasizing familial cooperation, responsibility, and the resilient inventiveness of children living in an isolated maritime community.