Agitation fills the film studios at Heiligwalde. The film star Maria Loria has been stabbed to death with a pair of scissors. According to all evidence, her partner Roger Moon appears to have been the killer. But he swears that he is innocent. This is the great hour for commissioner Spalt and his assistant Edgar: A series of mysterious clues finally leads the investigation to a solution of the crime; after all, the existence of all those involved is at stake...