This is a book about first love and strong friendship, about difficult relationships with parents and even more complex relationships with classmates. Marina is used to being surrounded by the kindest and most loving people: her parents, grandmother, and best friend Yulia. Suddenly her world, which seemed so stable, collapses - her father leaves the family for another woman. It seems to Marina that life has stopped, but the events happening around her do not allow her to withdraw into herself. Yulia's bicycle is stolen, and as a result, her friends find themselves involved in dangerous events.