Best Investigation movies of 1970s

Actors : Donald Pilon, Jean-Louis Roux, Christopher Plummer, Karen Black,
Directors : Harvey Hart,

A detective investigating the death of a heroin-addicted prostitute uncovers evidence pointing to the existence of a murderous devil cult.

Actors : Ewa Aulin, Klaus Kinski, Angela Bo, Sergio Doria,
Directors : Joe D'Amato,

A man discovers an ancient Incan formula for raising the dead, and uses it for a series of revenge murders.

Actors : Percy Herbert, Carroll Baker, Lee Van Cleef, Stuart Whitman,
Directors : Alexander Singer,

A Native American born US Army officer, Captain Apache, investigating a murder, uncovers a presidential assassination plot.

Actors : Liv Ullmann, Max von Sydow, Trevor Howard, Per Oscarsson,
Directors : Laslo Benedek,

A man named Salem escapes from an insane asylum where he was confined for an axe-murder. Falsely convicted under a plea of "guilty due to insanity", he does not plan to let his sister and ...

Actors : Dennis Waterman, John Thaw, Ian Bannen, Barry Foster,
Directors : David Wickes,

Cinematic spin-off from the popular TV series. Hard-bitten Flying Squad officer Jack Regan gets embroiled in a deadly political plot when an old friend asks him to investigate the death of ...

Actors : Frederic Forrest, Al Lettieri, Robert Forster, Anthony Quinn,
Directors : Richard Fleischer,

After his mistress is savagely beaten up a Mafia leader goes after the killer with a bloody vengeance. Soon after the hunt begins, a gang war ensues.

Actors : Dennis Waterman, John Thaw, Denholm Elliott, Ken Hutchison,
Directors : Tom Clegg,

Second cinematic spin-off from the popular 70's police series. Regan & Carter head a Flying Squad investigation into a series of bank raids by a team of well-armed villains who are flying in from the continent.

Actors : Yôko Shimada, Kensaku Morita, Gô Katô, Tetsurô Tanba,
Directors : Yoshitarô Nomura,

Detectives investigate the murder of an old man found in a Tokyo rail yard.

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

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

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 : Tom Pittman, Bob Jones, Ray Lynch, Hal Reed,
Directors : Tom Hanson,

The San Francisco area is beset by a series of seemingly random murders without motive or pattern. The police are taunted by phone calls and letters. Could the maniac be the violent, truck ...

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 : 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 : 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.

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 : 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 : 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 : 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 : Ralph Bellamy, Forrest Tucker, Bob Hope, Eva Marie Saint,
Directors : Paul Bogart,

Bob Hope is a stressed out talk show host who is sent on a vacation to Arizona on doctor's orders and has to play Sherlock Holmes with his wife, the lovely Eva Marie Saint, to solve a series of murders that has Bob as the prime suspect.