The best Helga Liné’s mystery movies

Angelo Russo, a sixteen year-old girl, is found dead in a river, having been fatally violated with a large blunt instrument. Inspector Di Salvo is assigned to the case and focuses his investigations on St. Theresa's, the exclusive school where Angelo boarded. Three of the murdered girl's classmates, Franca, Paola and Virgina (who call themselves "The Inseparables"), receive threatening poems from an individual using the name "Nemesis". Bizarre "accidents" start to befall the girls: Franca is injured when someone causes her horse to bolt and Virgina nearly breaks her neck on marbles left at the top of a staircase. But Di Salvo is determined to find the killer, even if it means using unorthodox methods. He is aided by Angelo Russo's little sister Emily, whose helpful clues lead to a boutique owned by a dubious character and a vice ring where "rich influential men pay well for teenage favours" ...

Industrialist Jean is living a jet set life in late sixties Paris. Things are not so well at home with his frigid wife Danielle. He meets their new neighbour, Nicole, and they become lovers. But she has a sadistic ex-boyfriend, Klaus, which keeps showing up. It soon transpires that Danielle and Nicole are conspiring against Jean, Klaus being the hitman hired to murder him.

Diabolik was the "Genius of Crime", Kriminal was known as the "Genius of Evil". While the character was created after Diabolik, it was the first to make it to the big screen. Kriminal was considered more sadistic than Diabolik (though in later tales he softens up and does heroic deeds), and while we see him do some nasty, cruel things, such as the attempt to blow up his ex-wife, the steam bath death of Lady Gold and putting acid in the shaving cream can of his criminal opposite Alex; he somehow doesn't come off as vicious as he was in the fumetti.

An innocent man accused of a murder hides out aboard a steam ship in South American.

A groundskeeper's son, who is mentally unstable due to childhood trauma, goes on a murdering spree where his perception of reality is distorted by imagining people as mannequins and vice versa.

A notable opera singer tries to commit suicide because of a emotional breakdown. While hospitalized in a psychiatric clinic, her daughter cautiously approaches the man she considers to be the blame for the state of her mother in order to gain her revenge.