Have Koko and friends managed to solve new cases of mysterious devastation that spoiled the summer holiday idyll at Green Mountain will be discovered in cinemas already this winter.
The alarm on Green Mountain is a kind of pre-emption of previously recorded movies (Whole and Ghosts, "The Forgotten Boy" and "Love or Death") that accompanies exciting events in the life of Ratko Milić - Koka before his resettlement in Zagreb.

The series of films produced according to popular novels by Ivan Kusan is the first children's film series in Croatia, and Koku's films at home-made cinemas have so far looked more than 200.000 viewers. The director of the new sequel is signed by the film and TV director Čejen Černić, who is also a koscenaristica, and the screenplay was written by Hana Jušić. Artistic project supervisor is Daniel Kušan, director of photography Danko Vučinović, editor Slaven Zečević, composer Dinko Appelt, sound designer Dubravka Premar, sculptor Ivan Veljača, costume designer Emina Kušan, and master mask Martina Novaković. Producers are Ankica Jurić Tilić and Hrvoje Pervan.

The film produces Kinorama and will be distributed by 2i Film. The project was supported by the Croatian Audiovisual Center and the Creative Europe Program - the MEDIA subprogram, while the production of the film was supported by the Croatian Audiovisual Center.