Naked Girl Killed in the Park (Italian: Ragazza tutta nuda assassinata nel parco, Spanish: Joven de buena familia sospechosa de asesinato) is a 1972 giallo film directed by Alfonso Brescia,[1] co-written by Gianni Martucci and starring Robert Hoffmann and Adolfo Celli.

[2] In World War II Berlin, a mother and a son are tied up at their chateau, while a Nazi soldier assembles a time bomb.

In present-day Madrid, a Tunnel of Horrors theme park attraction holds a tram car with a dead aristocrat Johannes Wallenberger.

They send their best investigator, young, charismatic Chris Buyer, who's had an immaculately perfect closing record, to infiltrate the family.

Chris brings Catherine a drink, but she ends up rebuffing him, revealing she's been blackmailed by harassing phone calls about her father's murder.

Johannes' study, where his things are being moved to, is off limits by the orders of matriarch Magda, who's still in shock from her husband's death and speaks to him as if he can hear her from beyond.

Meanwhile, Inspector Huber is reading through the family finances, where he determines Johannes feared he was in danger and thus took out the policy before he was murdered.

The painting of Johannes, showing with a suit and cane, resembles an unseen figure near the mansion the night before.

On a horseback ride, Barbara offers Chris information on Johannes' murder at a late night meeting in the barn.

Sybil looks out of a window and sees in the nearby woods Barbara lying dead, completely nude and with her throat slashed.

Magda sits in Johannes' study, starting at his portrait while playing orchestral music on a record and getting steadily drunk.

The lights go out, and when Sybil goes to check the fuse box, her throat is slashed with a straight razor by an unseen assailant.

A woman on the line plays a tape of a man's whispered voice, saying time is running short to reveal her father's killer, causing her to pass out again.

The figure chases her slowly through the house, and every time Magda opens a door, she flashes back to that fatal night in Berlin.

When Johannes tries to swing his cane at her, she stumbles back into a railing Huber pointed out was loose earlier.

He tracked down Johannes and forced him to take out the life insurance policy for a bribe, then left his body in the Tunnel of Horrors, one of his many setups as a distraction of the investigation.

Catherine stumbles downstairs, shocked by Chris' guilt, down to his phone calls to her and breaking into her townhouse to worsen her heart condition.