This is a book about summer vacation, friendship, love, and adventures—about all those most important events that SUMMER holds within itself. Ten-year-old Ulf and Percy build a cabin, swim in the sea, play Indians, help a friend collect beetles, and read a book about Buffalo Bill—the famous hunter of bison from the Wild West. In an unexpected way, Percy manages to win over the entire family, even Ulf’s angry grandpa—and all of his friend’s pals. Even Pija, the little girl Ulf is hopelessly in love with! Can boys’ friendship stand up to such trials?