Koko and his friends are spending summer vacation on the shores of a lake near the idyllic Green Hill, hanging out and playing. The magical countryside is disturbed by unusual events which alarm the children as well as the locals: under cover of night, burglars break into one house after another. When the police turns a blind eye to denunciations by adults, the children decide to take matters into their own hands and unmask the burglars.
Elenco: Marko Tocilj , Alex Rakoš , Jan Pentek , Tin Gregorić , Jakov Piljek , Ozren Grabarić , Dijana Vidušin , Lucija Philips , Sara Čolaković , Toma Serdarević , Dora Bilić , Zvonimir Jurić , Janko Rakoš , Olga Pakalović , Krešimir Mikić .