It's holiday time. Everywhere there is a good mood. But Koko's family has to make a sad discovery one morning. Their dog has been poisoned and their newly purchased lawnmower has been stolen. When other objects disappear around them, Koko and his friends set out to track down the thieves. Not only do they gain surprising insights into the lives of the villagers, but they also learn to revise their hasty judgements, such as suspecting outsiders or rejecting the friendship of girls of the same age.