"In the Norwegian city of Bergen lives a completely ordinary Norwegian family: mom, dad, six-year-old Martin and his older sister Matilda. But everything changes, and life suddenly becomes filled with adventures when their grandfather Oscar, whom the children have never seen before, comes to visit them. It is not for nothing that Oscar was nicknamed Chocolate Grandpa, because he has a terrible sweet tooth and cannot live without candy and chocolate. And believe it or not, he can walk on the ceiling, such an unusual grandfather! At the same time as Oscar, the Paulsen sisters also arrive in Bergen, three rather naughty ladies who, on the contrary, cannot stand sweets and dream of all the cakes and pastries in the city becoming bitter or salty. Why do they need this and will they manage to disrupt the annual city sweets fair, or will someone interfere with their insidious plans? How does this exciting detective story end?
