The family council gathers to decide whether Villervalle and Lenalisa should be allowed to come with them to the South Seas.
Villervalle sets up villervalla on board. He captures atomic spies and encounters Kaoko.
Villervalle gets his first South Sea lesson in the "school of life".
The schooner Vaitere takes the Botman family out to the coral island of Raroia. Villervalle gets new acquaintances and he discovers that the atomic spies are on board.
The Botman family has a festive time at Raroia and Villervalle sees Kaoko again.
Father Ernst is woken up in the middle of the night and gets to assist in a child birth. Villervalle joins him. The Lucia celebration comes to an abrupt end.
Villervalle escapes from grandma and homework. Together with Kaoko, he fishes in the lagoon instead and there he gets to know an octopus.
Villervalle and Kaoko fish underwater with harpoon and Villervalle is attacked by sharks.
The Botman family accompanies the people of Raroia to an island on the other side of the lagoon to collect coconuts and make copra.
Villervalle sets out on a journey of discovery on Kopra Island. He discovers the Ghost Pits and falls into one of them. And then he is attacked by a giant crab.
A hurricane sweeps the island. Villervalle, Lena Lisa and Grandma save themselves on a raft and float ashore on an uninhabited island. There they are saved.
Villervale accompanies Tetohu and Kaoko to dive for pearls. He experiences the South Sea's fantastic underwater world and new adventures.
Villervalle and Kaoko scout for large sea turtles. They accompany the hunters and dive for the turtles. Then it is time for the Botman family to return to Sweden.