The pioneer Petya Konstantinov (Vladimir Konstantinov), as an award for the best young OSVOD member of Artek, receives his favorite book — "Gulliver's Travels" by Johnathan Swift. Together with other pioneers who repaired the sailboat "Artek" with their own hands, he goes on for a walk to the Adalara's islands which are near the summer camp. There, during vacation, children ask the leader to read them aloud Petya's book. Petya falls asleep while reading and finds himself in the world described in the book.