Anna is going to spend the summer holiday at her Grandmother’s house. Passing by a toystore on their way to Grandma’s, Anna sees the world’s most beautiful toy rabbit – but it’s not exactly free; it costs fifty kroner! But Grandma knows what to do, and gives Anna a summer job: She has to look after the animals in five houses, and gets ten kroner for each house. Fifty kroner in total! It’s just that one snake and two rabbits and three birds and four tomato plants and five fish can quickly turn into one saturated snake, one rabbit disappeared, ten new rabbit children, two birds, three wilted plants and five starved fish – especially if you prefer drinking iced tea on the balcony, rather than looking after animals and plants day in and day out. And how many ten-kroner coins do you earn then? Not five, at least.