Somewhere in Europe, next to a great sea, there is the village of Gadgetville, where inventing all kinds of useful gadgets for the home is highly valued. Every year, the villagers hold a competition of new inventions. One of the most famous inventors in the village is Oskar, father of the lively puppy girl Lotte. His main rival is Adalbert the hare, whose wife also participates in the competition wholeheartedly. Winning would be important for the family and would be a great honour for the entire hare clan. On the eve of another inventions competition, Lotte and her friend, Bruno the kitten find a sodden book in the sea. Susumu the Bee, a gardener from the far-away Japan, climbs out of the book.
Susumu teaches the villagers some judo moves before the competition and they eagerly begin using them to make their everyday lives easier. The villagers think that when it comes to household chores, judo may be even more helpful than complicated and stubborn machines.
The book is based on the cartoon Lotte from Gadgetville by Janno Põldma and Heiki Ernits.