Koko and his friends are spending their summer vacation by the 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 the cover of night, burglars break into one house after another, stealing anything valuable they can […]

It seems that football is still the most important thing in Koko’s life. Zlatko is still spending every second reading books and scolding Koko for being immature. To prove him wrong, Koko tells him that he is in love with a mysterious girl. His love for her is not making him happy. And the girl […]

The Mysterious Boy is another one in the series of stories about a clever 14-year-old boy Koko and his friends who solve mysteries. Koko’s friend Tomo has recently moved to the city and he craves adventure. Tomo and Koko are drawn to a new student who behaves strangely. Together with their classroom friend Marijana, they […]