Best Investigation movies of 1970s

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 : Arthur O'Sullivan, Anton Diffring, Luigi Pistilli, Dagmar Lassander,
Directors : Riccardo Freda,

In Dublin, a young woman is brutally murdered in her home by a maniac that throws acid in her face and then slits her throat with a razor. Her mangled body is later discovered in the boot ...

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 : Charles Grodin, Joan Collins, Art Carney, Farrah Fawcett,
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 : 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 : 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 : Barbara Bouchet, Nino Segurini, Farley Granger, Rosalba Neri,
Directors : Silvio Amadio,

A writer's secretary tries to find her missing friend and uncovers a murder plot.

Actors : Harold Sakata, George Lazenby, Jim Kelly, Terry Moore,
Directors : Al Adamson,

The Pig has a plan to eradicate some people with a freeze bomb that instantly freezes people to death. It is up to Detective Ash to stop him and protect the woman with the secret to the ice...

Actors : Victor Izay, Leslie McRay, Tom Pace, Lila Zaborin,
Directors : Ted V. Mikels,

Lorraine and Mark enter the world of witchcraft where Mara foretells the future and helps them remember their past lives. When a series of mysterious murders begin to occur, they turn to Dr. Helsford for advice.

Actors : Gwen Arment, William Metzo, Laura Misch Owens, Curt Dawson,
Directors : Jack Weis,

Police try to capture someone who is commiting ritual murders of women during Mardi Gras in New Orleans.

Actors : Joseph Cotten, Tomas Milian, Maria Fiore, Mario Piave,
Directors : Umberto Lenzi,

A biker's brother is killed while investigating the kidnapping of a young boy, the byproduct of a war between two crime families. The biker vows to get revenge by finding the kidnapped boy and destroying the two families.

Actors : Cheri Caffaro, Richard Smedley, Patrick Wright, Laurie Rose,
Directors : Don Schain,

Cheerleaders and models are kidnapped & sold by a white slavery ring. Female agent is sent to rescue them.

Actors : Diana Lorys, Paul Naschy, Eduardo Calvo, Eva León,
Directors : Carlos Aured,

An ex-convict, troubled by dreams that he strangles women, is hired as the caretaker on an estate owned by three very strange sisters. Soon after his arrival, a serial killer begins ...

Actors : David McCallum, Eric Server, Sandra McCabe, George Wyner,
Directors : Burt Brinckerhoff,

A pack of dogs go on a killing spree.

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 : Leslie Caron, Mitchell Ryan, Alex Dreier, Warren Oates,
Directors : Paul Magwood,

A hardboiled aging private eye is hired to find and protect a missing government witness sought after by the gangsters. The witness is a beautiful French woman and even the cops can't be trusted. The case is tough, but so is Chandler.

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 : 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 : Mel Ferrer, Lia Tanzi, Claudio Cassinelli, Gianfranco Barra,
Directors : Sergio Martino,

A young prostitute is found brutally killed and is up to detective Germi (Claudio Cassinelli) the investigation of the case, as the search progress he uncovers a girls trafficking ring with connections to powerful people.