Brave hero Parsifal, orphan and raised among wolves, must recover the Holy Grail from the hands of the evil wizard Klingsor, a Barbarian chieftain who killed his father, and thus save the wounded Amfortas, ruler of the Grail kingdom. Kundria, a beautiful and seductive houri, and even the Seven Deadly Sins will try to stop Parsifal and his noble quest.
An old violin maker has been killed and the investigators have only one clue: on the night of the crime, a blind street musician heard a melody playing in the house. As they do not know the title of the song, they present the music to the famous radio contest known as "The mysterious melody". Little by little the two inspectors will surround the killer after checking that there are several suspects.
