rock solid giallo from a master filmmaker of the genre and sergio martino . fashion from a marvelous screenplay by ernesto gestaldi and this shocking mystery often develop fascinating twist until the terrific finale which most might not see come throughout the film . it when everything have fall into place that we can go and ahh . the film revolve around the death of a husband ( . in an airplane explosion ) and the million dollar the wife receive from it . there be those with great interest in that money and one in particular be the dead man mistress . the wife be lisa ( ida galli ) and the mistress demand half the money be lara ( janine reynaud ) . she tell lisa she know that the death be arrange by her to get the insurance money . lara say she will use her lawyer and sharif ( luis barboo ) to get that money . so already and the film produce two possible suspect in the late murder of lisa and who await someone in tokyo . george hilton portray peter lynch . peter work for a company that investigate those who gain inheritance to see if the pay day be gather under suspicious mean . when and on his watch and lisa be kill by a man dress from head to toe in black in her hotel room and he be a possible suspect . he decide to do a little investigating himself and while also assist inspector stavros ( luigi pistilli ) and interpol agent and benton ( tom felleghy ) on their quest to find a killer . the killer strike several time eliminate anyone revolve around the miss million dollar confiscate by the one responsible for the murder of lisa . soon and the film follow a journalist and cléo dupont ( the delicious and luscious anita strindberg ) a she and peter meet for a dinner where she could try and sniff out anything that might break a story for her . soon they fall deeply in love and but it seem like anyone who be near peter be kill . soon someone attack cléo with an intent to kill which push the investigation far into uncharted territory . why would anyone wish to harm a journalist with no real fact to damage the one kill off people . this giallo be quite clever and excite to follow . the film never lull which be quite remarkable since so much happens leave open the question of the identity of the killer . this film follow the path of gialli with knife slashings because of a certain pattern the killer have take ( the throat and low torso ) . the film conclusion wrap up all the complex loose end and be quite satisfying . the film have some unique camera angle and but deliver the good in term of drive the plot and the execution of the mystery .