Fritz's new friend Emily is distressed by a family quarrel, and may have to leave the ship at the next port. Becca gets into the act and aggravates everyone but her good intentions are recognized and everything works out in the end.
When Brewster discovers his drowned master washed onto the beach, Fritz is especially moved because the captain died saving his life. Fritz and his father set off to explore the island and search for other survivors.
The family begins building their new house -- high in the branches of a tree. Becca wanders away from her responsibilities, and is washed from shore on a drifting log.
While Fritz and Ernest scale the mountains, the rest of the family scouts for supplies. Becca's playfulness almost ends in disaster, but her mother comes to the rescue, and they find an abundance of food.
When Fritz and Jack go fishing in the new canoe, their little pet Mercedes falls overboard. The danger of sharks prevents an easy rescue, but the dog Brewster saves the day.
Becca is excited about her first hunting trip -- until Fritz shoots a bird and her pity overcomes her taste for meat. She lures home a goat, providing milk and cheese as welcome additions to the family's diet.
Standing watch for ships at the cape is an important, though always useless job. But today Becca spots one, and the family's joy turns to desperation as their signals go unheeded. Though disappointed, they refuse to give up hope.
The Robinsons watch a turtle laying eggs on the beach, and are impressed with the solemn ceremony. Becca and Jack keep watch over the nest, fighting off a hungry snake, until the eggs hatch and the baby turtles disappear into the sea.
The cave is dry, but is it hospitable? The Robinsons find the cave already occupied by multitudes of bats -- and a skeleton, the grim remains of an earlier shipwreck victim who once lived on the island.
