Import Blu-ray/Region All pressing. Going about his everyday life of band rehearsals and socializing with his wife, Nina, and their hip friends, rock drummer Roberto Tobias notices he is constantly being followed by a strange man dressed in black. He decides to turn the tables on his stalker and follows him into an abandoned theater, where a confrontation between the two ends with Roberto accidentally stabbing the man, who falls into the orchestra, apparently dead. Suddenly, a flash of light alerts Roberto to a figure in the upper wings of the theatre, where a mysterious person wearing a bizarre puppet mask and brandishing a camera has been taking photos of the fatal struggle. Roberto flees the scene, but the next day receives the dead man's ID card in the post. Naturally assuming it has been sent by the unknown witness, he becomes immediately concerned by the lack of any blackmail demands and is haunted by the question of what it is the masked figure wants from him.