A doctor kills his girlfriend when he accidentally causes her to fall onto an ornamental flower which has metal spikes. He disposes of her by chopping up and then dissolving her corpse. The woman's sister accuses the doctor and an investigation begins. In the meantime, a second woman is killed and the doctor begins to receive metal petals through the post.
| Actor | Role |
|---|---|
 Gianni GarkoDr. Andrea Valenti | Dr. Andrea Valenti |
 Carroll BakerEvelyne Graffi | Evelyne Graffi |
 Ivano StaccioliIspettore Garrano | Ispettore Garrano |
 Pilar VelázquezLena | Lena |
 Paola SenatoreDaniela | Daniela |
 Umberto RahoPsychiatrist | Psychiatrist |
| EEleonora MoranaFemale surgeon | Female surgeon |
| AAngelo BassiNot listed | Not listed |
 Giuseppe MatteiNot listed | Not listed |
 Alessandro PerrellaFirst young surgeon | First young surgeon |
 Alba MaioliniFemale porter | Female porter |