Moominpappa has a flu, so it's time to read his memoirs. He was in an orphanage once, run by the strict Hemulen. After running away at night, the young Moominpappa learns about the beauty of nature and meets his first true friend, Hodgkins.
Moominpappa's memoirs continue. Hodgkins, his nervous nephew Muddler and the lazy Joxter have a houseboat in the woods. Now they just need to get a huge creature Edward the Booble to bathe in the river nearby. Some trickery is needed.
Moominpappa's memoirs, chapter 3. Hodgkins has a bad premonition about their sailing trip. First the silence is interrupted by the sound of the Groke. Then a strict lady Hemulen from the orphanage comes aboard. Then, the Niblings arrive.
Moominpappa is reading about his youth. A long sea journey with Captain Hodgkins, the Muddler and the Joxter is turning into an adventure: the Hattifatteners, thick clouds, a young Nibling with sharp teeth, and a furious storm.
Moominpappa was only a young adventurer when he was sailing with Hodgkins, the Muddler and the Joxter. When exploring the unknown coast, they meet the Mymble's Daughter. She tells about the island's real practical joker, the King.
Chapter by chapter and even during the night, Moominpappa keeps reading his memoirs. The young Moominpappa has a surprise for his friends at midnight. He recruits help from a real ghost, but now the Island Ghost doesn't want to leave.
Moominpappa's memoirs move high to the clouds and then under the sea. Hodgkins' new invention is finally ready and his crew, including the young Moominpappa, will guide the flying submarine to the great depths. Beware the sea monster.
Moominpappa devotes a whole chapter of his memoirs to Sniff's parents, the Muddler and Fuzzy. The wedding reception of a young couple in the island of the King gets a visitor: an ambassador of the Niblings. But where's the Lady Hemulen?
The last chapter of Moominpappa's memoirs is a dramatic love story. A furious storm hits the island and the night needs a hero. First the young Moominpappa rescues Mymble's Daughter and her orphans, and then a very special Moomin girl.
A peaceful summer day in Moominvalley is interrupted by the ash falling from the sky and at night it gets worse: the earth starts to tremble and crack, the horizon becomes red and the great waves are coming. A nearby volcano is erupting.
The volcano has calmed down after a night of dramatic activity, but the Moominvalley is still flooded. When the water keeps rising, the Moomin family and their new friends Whomper and Misabel have to move to a peculiar floating house.
The new house floats further and further away and the Moomin family, along with Whomper and Misabel, keep discovering something new: stage backdrops, props, costumes and wardrobe. But who's lurking in the shadows, laughing?
The floating house is actually a theatre with a stage. After the girls discover the dressing rooms, the old theatre rat Emma will introduce them to the world of the arts. But before the premiere, Moominpappa has to write a play first.
When the theatre floats to a forest, Moomintroll and Snork Maiden decides to spend the night on a tree. When they wake up, the house is gone. The Moomin parents are worried, but the children have already found dry land. And a house.
Snufkin travels with Little My and has a settle to score with Hemulen, the local park keeper. The plan involves the Hattifatteners and a big scare for Hemulen. It's time to free the park from restrictive signs for the children to play in.
It's Midsummer and Fillyjonk feels gloomy. Her mood slowly changes when Moomintroll and the Snork Maiden knock on the door. A bonfire is lit and small rituals held, but only the bossy Park Keeper Hemulen appears at dawn.