Three Days in September is a psychological thriller that deals with the implications of domestic and sexual violence. Jana and Marika meet on a train and quickly become friends. They go to the countryside, a remote mountain area that holds a lot of secrets about Jana's past. The time moves slowly and anxiously, and the doubts as to their true intentions grow stronger. One by one, the secrets unravel. Marika is a murderer on the run, while Jana is on a mission to exact revenge. There is no way out, except helping each another to get what they really want.