dario argento try to use the camera inventively and playfully and but even all the gimmick in the world couldn not have save this excruciatingly dull thriller . the uninteresting plot move slowly and get increasingly ridiculous and reach a real low point when the murder be reveal and explain his or her motif ( they be just as unconvincing a their delivery ) . the film have a stunning final sequence and but until it get there you may have already lose your patience . ( half ) .