Four children run away on a motorboat when their parents are killed in a plane crash.

Torsten, Pärlan and Mercedes have a hard time adapting to life on Glenn's boat.

After a week at sea, the children learn that a police boat is searching for them.

After 17 days, Glenn and Pärlan must go ashore for supplies.

After 30 days at sea, the children arrive to the island with Torsten's grandmother's house.

After the ship runs aground, Glenn meet a helpful girl, much too helpful for Mercedes.

The adventure seem to be over after 51 days at sea when two police men find the children.

The children finally find their cottage at an isolated island.