Best Investigation movies of 1970s

Actors : Charles Grodin, Joan Collins, Farrah Fawcett, Art Carney,
Directors : Richard C. Sarafian,

After a rich old man dies in a suspicious car accident in Acapulco, his widow wants his insurance company to pony up $5 million. A hotshot investigator Decker (Grodin) and a charming model (Fawcett) come in to check it out.

Actors : Thalmus Rasulala, Dean Martin, Eugene Roche, Denise Nicholas,
Directors : Paul Bogart,

A San Francisco attorney (Dean Martin) is hired to defend a black militant accused of murder.

Actors : Silvano Tranquilli, Sylva Koscina, Annabella Incontrera, Farley Granger,
Directors : Roberto Bianchi Montero,

A serial killer is on the loose. His victims are unfaithful wives and he always leaves compromising photographs at the crime scene.

Actors : Natsuko Yashiro, Tamaki Katsura, Yôko Azusa, Yuri Yamashina,
Directors : Yasuharu Hasebe,

Two restaurant employees begin a torturous and sexual killing spree after they accidentally kill a hitch hiker and find that murder and mutilation is their mutual aphrodisiac.

Actors : Dana Wynter, Michael Burns, Jay Silverheels, Glenn Ford,
Directors : Gary Nelson,

A bounty hunter takes in the son of a man he killed.

Actors : Naseeruddin Shah, Smita Patil, Amrish Puri, Om Puri,
Directors : Govind Nihalani,

A public prosecutor discovers the harsh realities about life of the scheduled tribes in India during 1980s while defending a case of a tribesman charged of murdering his wife.

Actors : Leonora Fani, Jeff Blynn, Gianni Dei, Michele Renzullo,
Directors : Mario Landi,

In Venice a detective is on the trail of a killer who commits a double murder (a married couple) then more grisly killings occur. Sex, drugs, gore and perversions are ingredients of this sadistic and sleazy giallo.

Actors : Anthony Steffen, Sylva Koscina, Giovanna Lenzi, Renato De Carmine,
Directors : Sergio Pastore,

A blind pianist tries to figure out who is responsible for a string of murders using a black cat with its claws dipped in curare.

Actors : Mascha Gonska, Romy Schneider, Philippe Brizard, Michel Piccoli,
Directors : Francis Girod,

A cunning French legal adviser teams up with an unemployed German girl and her sister to commit murders in Marseille.

Actors : Jean-Louis Trintignant, Jacqueline Bisset, Marcello Mastroianni, Aldo Reggiani,
Directors : Luigi Comencini,

Police commissioner Santamaria is investigating the murdering of the ambiguous architect Mr. Garrone. The investigations soon drive him into the Torino's high society. Santamaria suspect ...

Actors : David Bailey, Randolph Roberts, Scott Brady, Tiffany Bolling,
Directors : Richard L. Bare,

A tongue-in-cheek psycho movie in "Duo-vision." The entire feature employs the split-screen technique used in parts of Brian De Palma's "Sisters" that same year. As a handyman at a seacoast...

Actors : Robert Mitchum, Mike Connors, James Franciscus, Jaclyn Smith,
Directors : Ted Post,

A woman is convinced by her lover to poison her cruel husband, a rich businessman. However, she becomes terrified when she finds the lover dead as well. A sinister PI, who's investigating her husband's disappearance, contacts her.

Actors : Philippe Clay, Cindy Eilbacher, Tsilla Chelton, Marcel Marceau,
Directors : William Castle,

A mute puppeteer uses a deceased scientist's invention to control dead bodies like puppets.

Actors : Tom Laughlin, Delores Taylor, E.G. Marshall, Teresa Kelly,
Directors : Tom Laughlin,

After a senator suddenly dies after completing (and sealing) an investigation into the nuclear power industry, the remaining senator and the state governor must decide on a person who will ...

Actors : Yôko Shimada, Teruhiko Aoi, Mieko Takamine, Kôji Ishizaka,
Directors : Kon Ichikawa,

After the death of the Father , His family are gathered to share Inheritances , but suddenly a woman with a mysterious masked man arrive there , claiming to be the other wife of the man ...

Actors : Judith Resnick, Martin Barolsky, Earle Edgerton, Kaly Mills,
Directors : Leonard Kirtman,

A psychopathic killer uses the carousel ride at a carnival to pick his victims, whom he then murders and dismembers.

Actors : Cameron Mitchell, William Gray Espy, Aldo Ray, May Britt,
Directors : Herb Freed,

May Britt plays a seemingly innocent farm girl convinced that her slovenly uncle (Cameron Mitchell) is the man responsible for the bloody scissor-murders of several local girls.

Actors : David Moses, Diana Davidson, Toni Jannotta, John Stinson,
Directors : William Malone,

An ex-cop, now working as a hack novelist, is called out of retirement to help investigate a string of deaths that appear to be the work of a serial killer but soon are revealed to be the ...

Actors : Verna Bloom, Henry Darrow, Eddie Egan, Robert Duvall,
Directors : Howard W. Koch,

After his suspension for the shooting death of drug runner, a New York City cop vows to keep the streets clean, any way he can.

Actors : Jean-Pierre Aumont, Michèle Morgan, Philippe Léotard, Serge Reggiani,
Directors : Claude Lelouch,

A very unorthodox police inspector is assigned to investigate a millionaire's mysterious death.