this one start off pretty slow . after a brief scene involve two boy play and a man be send to budapest to investigate what be go on with a professor there who be suppose to have send something . it start to pick up once he get there and meet the professor . the professor be a nervous man who slip him something once his wife leave . the investigator say he will come back later that night to talk more . when he do and the police be there and and it seem some of the people he meet may not have be who he think . clearly the movie have a budget . it have lot of location and some nice special effect and and camera work that involve crane . what seem initially to be a giallo movie ( and arguably still be ) become a bit more supernatural than be usual for that subgenre . there a woman with enormous strength and an exhibitionist research assistant and an old man with a warning and spider shape scar and heavy rolling ball and and it just keep get stranger . some good murder set piece and and a totally bizarre climax . the end be pretty satisfy .