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.
It's the middle of cold winter but Moomintroll is awake, caretaking the Moominhouse and feeling very lonely. Also awake is a mischievous Little My, looking for a perfect snow sledge, and Too-Ticky, mainly relaxing in the bathing hut.
The sun is shining, the snow is melting and Too-Ticky turns her cap inside out. All signs that spring is coming. The skating season is also over, as Little My learns when she gets stranded on the ice. Moominmamma wakes up.
Hemulen feels it's his duty to wake up the sleeping Moomin family to prepare for a Christmas Eve. None of the Moomins have never heard of such celebration, but soon feel the spirit of Christmas next to a beautifully decorated tree.
The nervous duo of Thingumy and Bob arrive from the mountains, carrying a mysterious suitcase. When they inform that the frightening creature Groke is coming, the whole Moomin family goes into panic mode. The night will be chilly.
Moominmamma's dream about a simple life on a lighthouse continues. Everyone feels a bit gloomy, especially Moominmamma. Being homesick, she starts to draw and paint on the walls. Through painting, she's literally back in her garden at home.
It seems as if time has stood still in Moominvalley and even the sun has gone away. Moomintroll, Too-Ticky and Little My witness something beautiful and terrifying: the Lady of the Cold. Just don't look into her eyes.
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.
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.