Stompa takes on the Atlantic Ocean to surprise his origins in New York. He is mustering on a 20,000-tonne ship together with his friend Nøtterø who would like to sail the seven seas during the summer holidays.

Stein Oscar Magel Paus-Andersen (ST.O.M.P.A.) starts at Langåsen boarding school in Stakavik, where he meets his new friends Bodø, Bergen, Nøtterø and Sørlandet. They find themselves tangled up in troubles with a spider, a fire drill and a swimming contest leading to detention.

Stompa has turned seventeen and has acquired interests other than innocent mischief. He falls in love with the mysterious Nel Shaiba from a traveling circus that has settled in town.

Langåsen boarding school has its 50th year anniversary, and the students are to make a celebration show in the auditorium. Trouble is brewing when a school inspector is to visit the school at the same time.