Best Investigation movies of 1970s

Actors : Hedda Lubin, Frank Kress, Amy Farrell, Henny Youngman,
Directors : Herschell Gordon Lewis,

A young reporter enlists the help of a top notch private eye to solve the murder of a female stripper at a Chicago nightclub.

Actors : Alberto de Mendoza, Anita Strindberg, George Hilton, Ida Galli,
Directors : Sergio Martino,

The Case of the Scorpion's Tail begins with the mysterious death of a millionaire and spirals into the murder of his suddenly rich wife, which draws the attention of a dogged investigator, who follows a trail of blood to the bitter end.

Actors : Robert Walden, Deborah Winters, Mark Goddard, Zalman King,
Directors : Jeff Lieberman,

A bizarre series of murders begins in Los Angeles, where people start going bald and then become homicidal maniacs. But could the blame rest on a particularly dangerous form of LSD called Blue Sunshine the murderers took ten years before?

Actors : Martin Balsam, Charles Bronson, Paul Koslo, Jack Colvin,
Directors : Michael Winner,

A Los Angeles detective is sent to New York where he must solve a case involving an old Sicilian Mafia family feud.

Actors : Albert Finney, Janice Rule, Frank Finlay, Billie Whitelaw,
Directors : Stephen Frears,

Nightclub comedian Eddie Ginley fulfills his Dashiell Hammett love by putting an ad in the paper as a private eye.

Actors : D'Urville Martin, Rudy Challenger, Pam Grier, Austin Stoker,
Directors : William Girdler,

A Chicago private detective returns back home to Louisville, Kentucky, to help her father fight mobsters.

Actors : Joop Doderer, Richard Attenborough, Derek Jacobi, Nicol Williamson,
Directors : Otto Preminger,

When a leak of information in the African Section of British Intelligence is discovered security man Daintry is brought in to investigate.

Actors : George Peppard, Christine Belford, Michael Sarrazin, Cliff Potts,
Directors : Lamont Johnson,

A government investigator tries to find out the truth behind the break-in at a top secret research facility.

Actors : Marcel Bozzuffi, Lino Ventura, Paolo Bonacelli, Tino Carraro,
Directors : Francesco Rosi,

A detective (inspector Rogas) is assigned to investigate the mysterious murders of some Supreme Court judges. During the investigation he discovers a complot that involves the Italian ...

Actors : Ben Johnson, Burt Reynolds, Paul Winfield, Catherine Deneuve,
Directors : Robert Aldrich,

At the instigation of a grieving father, a Los Angeles cop investigates the suspicious circumstances of a girl's apparent suicide.

Actors : Cameron Mitchell, Rip Torn, Stella Stevens, Jim Brown,
Directors : Jack Starrett,

Slaughter, a former Green Beret, avenges the killing of loved ones by the Mob, and in so doing is coerced by the Feds into traveling to Mexico to finish off surviving mobsters.

Actors : Jean-Louis Trintignant, Claudine Auger, Renato Salvatori, Alain Delon,
Directors : Jacques Deray,

This movie depicts the authentic story of the hunt for the dangerous criminal Emile Buisson, who escaped from prison in 1947. During three years Buisson manages to hide from detective ...

Actors : Christine Kaufmann, Jason Robards, Herbert Lom, Adolfo Celi,
Directors : Gordon Hessler,

Paris...at the turn of the century. Inspector Vidocq investigates a series of unexplained murders at a Grand Guignol-type theatre...where the players have suddenly become real-life victims. Based on the story by Edgar Allan Poe.

Actors : Lee Patrick, George Segal, Lionel Stander, Stéphane Audran,
Directors : David Giler,

The son of famous detective Sam Spade carries on the family tradition of getting involved with the Maltese Falcon - and with the people who will stop at nothing, including murder, to get it.

Actors : Bill Cosby, Ta-Ronce Allen, Rosalind Cash, Robert Culp,
Directors : Robert Culp,

Bill Cosby and Robert Culp ("I Spy") are united again as private eyes in this Walter Hill-scripted "film noir." Searching for a missing girl, they find themselves involved with vicious criminals and precipitating a string of deaths.

Actors : Alexander Knox, Sven-Bertil Taube, Patrick Allen, Barbara Parkins,
Directors : Geoffrey Reeve,

Following a triple professional hit a U.S. agent arrives in Amsterdam to investigate a heroin smuggling ring. He finds a city rife with drugs and a police force unable or unwilling to do ...

Actors : Bruno Cremer, Jean Négroni, Patrick Fierry, Jean-Paul Belmondo,
Directors : Philippe Labro,

L'Alpagueur is a free-lance spy from the French secret agency. He's put on the investigation about L'epervier, a serial-killer who employs young boys to help him robbing banks before ...

Actors : Edwige Fenech, Nino Castelnuovo, Femi Benussi, Solvi Stubing,
Directors : Andrea Bianchi,

When a fashion model dies during an abortion, a series of murders begins, starting with her doctor. The next victims are connected to the modeling agency where she worked, Albatross, run by...

Actors : Evert Anderson, Anja Schmidt, Thommy Berggren, Kelvin Malave,
Directors : Bo Widerberg,

About the life and death of the legendary Swedish/American agitator Joe Hill.

Actors : Roger Davis, Stuart Whitman, Janit Baldwin, Piper Laurie,
Directors : Curtis Harrington,

Sixteen years after Ruby Claire's gangster boyfriend was shot and killed by four associates, a series of gruesome murders takes place at the drive-in movie theatre she now owns. Meanwhile, ...