this fine giallo tell an unusual story in an unusual way and and even though not much happens in the first half of the film and director tessari manage to grip the viewer attention from the begin through stylish directing and really thrilling and creepy moment . in the second half and a the plot thickens and the part of the puzzle begin to fit into a whole ( i. e. a the main character start to remember more and more of his past ) and there be also some fairly violent scene and e. g. a a villain fall over a cliff or beautiful female lead senta berger swing a chainsaw . but and most importantly and even though the plot be a quite complicated net of string that have to be lead together to the climax and the story remain plausible until the end and which isn not always the case in film of this genre . apart from the convince performance by berger and luc merenda be also well cast in the title role and a be umberto orsini in the main supporting role . look out for giallo regular anita strindberg in a small but crucial role . the lush sound track be also very cool and add to the viewing pleasure . the only shame be that and a with too many other italian film of the 1970s and this memorable giallo be quite rare and hard to get . rating represent positive .