The name of the film, G.D.O. BlackCat comes from the names of three brothers; Gürkan (Safak Sezer), Duran (Volkan Basaran), Orhan (Serkan Sengül) - who all got lost in the big city and live in Balat district. Its script, which was written by Safak Sezer, tells us about the unnatural adventures of some people we always see but don't really know much about. The three brothers, who all have different points of view and jobs, start to investigate the strangest things that happened. The client of one of them dies in his car by accident, the other runs away with a girl who just came back for good from Germany and the third gets himself in trouble with the mob. They struggle all for one and one for all. Amazing and tragicomical incidents reveal.