Rebecca is six and a half years old, and her parents have separated. For a bit of fresh air, she's spending her vacation in the countryside at Grandpa Bug's. It's a bit boring there, without much to do, though even Rebecca has to admit the outdoors are doing her some good. But why has her friend Ernest disappeared? Is he hiding? Luckily, Grandpa Bug's there in the meantime to take long walks and teach Rebecca about nature! He seems to know a lot of stuff that's good for her...