It's the end of summer and 9-year-old Johan is bored. He ought to be working on the old Volvo with his dad, but the old man won't get off of his hammock; Johan, as a result, spends most of his time on his bike playing with his slingshot. One day, Johan accidentally injures a rabbit, which belongs to Anna, a 9-year-old girl who lives close by. He does his best to heal the rabbit's wounds without letting dad or Anna know; he even builds an animal hospital, but eventually he has to own up to his actions...