[1][2] Luca, an Italian musician who lives in Prague as a music teacher at an elementary school, is in the grip of uncontrollable jealousy for his girlfriend Klara, an art history student about to graduate.

Suspicious of the ambiguous relationship that the girl has with Pavel, her tutor at the university, Luca assigns a detective, Denis, to control her.

After the first stalking, carried out with the help of sophisticated technologies, the detective decides to hide some evidence that he considers unimportant, almost as if he wants to protect his client from tormenting himself by unnecessary and unfounded suspicions.

Denis, who lives an extremely open relationship with his wife Ruth and is in love with Nina, his assistant in the agency, loses serenity and professional "detachment".

Director Roberto Faenza said in the bathtub sex scene between Laura Chiatti and Claudio Santamaria he left the actors completely alone.