Stephan (Jan Dolanský), a former police officer turned private investigator, is hired by a wealthy client to spy on Raluca (Malvína Pachlová), an alluring young woman suspected of shady dealings. What begins as a routine surveillance assignment quickly spirals out of control when Stephan becomes dangerously obsessed with Raluca. Abandoning his professional boundaries, Stephan enters into a passionate, secret affair with her, entangling himself in a deadly web of blackmail, murder, and betrayal where Raluca is not who she seems.