A nine part adaption of Aleksander Minkowski's novel, filmed in the area of Lake Luknajno. A teenage girl named Majka (pronounced Mika) falls out with her father who she believes has treated one his work colleagues unfairly. She runs away from home and hides out in the reeds on the shore of a large lake. She manages to evade the local MO Station commander and his deputy who regularly patrol the lake in a motor boat. Ariel, the commander's son, soon finds Majka's hiding place but keeps it a secret. Like Majka, Ariel also has a strained relationship with his father. His mother died when he was young and he disapproves of his father's blossoming affair with local doctor Badowska. Ariel and Majka find themselves sharing common ground. Ariel does his best to supply shelter and food for Majka but the pair are constantly at risk of being found out as the commander is involved in other investigations around the lake. Ariel and Majka begin to develop a restrained romance.