Friendship is not such a simple matter, and Julka knows it. She is 12 years old, goes to a boarding school and has never had a real friend yet. Holidays begin, and trouble with them. Julka, instead of her parents in Canada, goes to her aunt in Warsaw. Olek lives in the same building. When kids fall into the hands of a treasure plan, the adventure begins. On the way to solve the mystery is a thieving shack, a nanny - a heavy smoker and a suspicious candy eater. No one is what they say they are and the race continues over time. In order to get out of this story, Julka must overcome distrust and dare to be friends.