The story follows a young apprentice who joins a lighthouse construction crew on a rugged coastal island and learns practical skills while taking part in dangerous work and summer camaraderie. Episodes include aerial-cable rides to the site, a contest to secure the rock for the tower, confrontations with lobster pirates that lead to a raid and a chase, an arrest and a reef accident, and the discovery of a key find that affects the crew's fortunes. The narrative blends adventurous action with technical detail about lighthouse building and emphasizes teamwork, honor, seamanship, and the protagonist's growing resourcefulness.