Ten obcy
 The book is about teen love problems and the challenges of growing up. Major characters are four friends: Ula, Pestka (Pip), Julek and Marian. The action takes place in a small village called Olszyny, which is located about 150&nbsp;km from Warsaw. During the holidays children spent a lot of time on an island created after the spring floods. They create a hut and set the poles in order to make access to the island easier. One day on the island shows up a mysterious boy. It turns out that the boy is injured, so the group of friends decides to take care of him. At first the boy is a man of few words, but eventually begins to reveal his secrets.