Dávid - a man living alone - one day receives an email. The email is about an unknown but also special software that is offered only for him, for free. Dávid's friend Oszkár tells him that the software is capable of rewriting reality, but also warns him to ignore the email, because it can be dangerous. Dávid doesn't listen to Oszkár, and downloads the software.

A man named Botond meets a stranger who asks him to catch three monsters in the lake. Botond finally agrees, and that's when things take a turn for the worse.

After a chance meeting, Zsolt and Ildikó delve into the mystery of the enigmatic Horsehead, uncovering eerie clues to unveil the figure's true identity and motives.