Best Investigation movies of 1970s

Actors : Hal Holbrook, Harry Guardino, Katharine Ross, James Garner,
Directors : James Goldstone,

California small town police chief investigates a suspicious death involving the victim's own dog that presumably killed its owner.

Actors : Andrew Byatt, Lisa Kreuzer, Sandy Ratcliff, David Beames,
Directors : Christopher Petit,

Set in 1970's Britain, a man drives from London to Bristol to investigate his brother's death. The purpose of his trip is offset by his encounters with a series of odd people.

Actors : Yumi Kanei, Masakazu Tamura, Hiroshi Tsukata, Meiko Kaji,
Directors : Yasuharu Hasebe,

Once again on the lam, Matsu is helped by a strip club worker who holds a grudge against the detective who's trying to find her.

Actors : Jacqueline Bisset, Jill Clayburgh, Ryan O'Neal, Warren Oates,
Directors : Bud Yorkin,

A computer programmer decides to become a thief. And when he starts making waves an insurance investigator hounds him. He also meets a woman who becomes his accomplice.

Actors : Yvonne Furneaux, Ely Galleani, Ugo Tognazzi, Vittorio Gassman,
Directors : Dino Risi,

An obscure Italian magistrate suspects that a well-known industrialist commited murder, and decides to investigate him, and bring him to court, whatever it takes. But - will the magistrate ...

Actors : Jon Finch, Sterling Hayden, Harry Andrews, Jenny Runacre,
Directors : Robert Fuest,

After the death of his Nobel Prize-winning father, billionaire physicist Jerry Cornelius becomes embroiled in the search for the mysterious "Final Programme", developed by his father. The ...

Actors : Jennifer O'Neill, Christopher Lee, Anthony Quinn, Michael Sarrazin,
Directors : James Fargo,

In 1948, at the U.S. embassy in Zadestan, a young diplomat is ordered to find the missing daughter of an influential American senator.

Actors : Lisa Moore, Bhetty Waldron, Pam Grier, Bernie Casey,
Directors : George Armitage,

A lawyer whose brother was murdered winds up getting involved with gangsters and the world of porno movies.

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.

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

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

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

A pack of dogs go on a killing spree.

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.