Best Investigation movies of 1970s

Actors : Ingrid Bergman, Lauren Bacall, Sean Connery, Albert Finney,
Directors : Sidney Lumet,

In December 1935, when his train is stopped by deep snow, detective Hercule Poirot is called on to solve a murder that occurred in his car the night before.

Actors : Jon Finch, Barbara Leigh-Hunt, Anna Massey, Barry Foster,
Directors : Alfred Hitchcock,

A serial murderer is strangling women with a necktie. The London police have a suspect, but he is the wrong man.

Actors : Al Pacino, Paul Sorvino, Richard Cox, Karen Allen,
Directors : William Friedkin,

A police detective goes undercover in the underground S&M gay subculture of New York City to catch a serial killer who is preying on gay men.

Actors : Hal Holbrook, Clint Eastwood, Mitchell Ryan, David Soul,
Directors : Ted Post,

Dirty Harry is on the trail of vigilante cops who are not above going beyond the law to kill the city's undesirables.

Actors : John Osborne, Ian Hendry, Britt Ekland, Michael Caine,
Directors : Mike Hodges,

When his brother dies under mysterious circumstances in a car accident, London gangster Jack Carter travels to Newcastle to investigate.

Actors : Roy Scheider, Jane Fonda, Charles Cioffi, Donald Sutherland,
Directors : Alan J. Pakula,

A small-town detective searching for a missing man has only one lead: a connection with a New York prostitute.

Actors : Christopher St. John, Moses Gunn, Richard Roundtree, Charles Cioffi,
Directors : Gordon Parks,

Cool black private eye John Shaft is hired by a crime lord to find and retrieve his kidnapped daughter.

Actors : Bruce Dern, Barbara Harris, Karen Black, William Devane,
Directors : Alfred Hitchcock,

A phony psychic/con artist and her taxi driver/private investigator boyfriend encounter a pair of serial kidnappers while trailing a missing heir in California.

Actors : Paula Prentiss, William Daniels, Walter McGinn, Warren Beatty,
Directors : Alan J. Pakula,

An ambitious reporter gets in way-over-his-head trouble while investigating a senator's assassination which leads to a vast conspiracy involving a multinational corporation behind every event in the world's headlines.

Actors : Samantha Eggar, Henry Beckman, Art Hindle, Oliver Reed,
Directors : David Cronenberg,

A man tries to uncover an unconventional psychologist's therapy techniques on his institutionalized wife, amidst a series of brutal murders.

Actors : Gene Hackman, Bernard Fresson, Philippe Léotard, Fernando Rey,
Directors : John Frankenheimer,

"Popeye" Doyle travels to Marseille to find Alain Charnier, the drug smuggler who eluded him in New York.

Actors : Eileen Brennan, Alec Guinness, Peter Falk, Peter Sellers,
Directors : Robert Moore,

Five famous literary detective characters and their sidekicks are invited to a bizarre mansion to solve an even stranger mystery.

Actors : David Warner, Malcolm McDowell, Mary Steenburgen, Charles Cioffi,
Directors : Nicholas Meyer,

H.G. Wells pursues Jack the Ripper to the 20th Century when the serial murderer uses the future writer's time machine to escape his time period.

Actors : Mia Farrow, Peter Ustinov, Jane Birkin, Simon MacCorkindale,
Directors : John Guillermin,

As Hercule Poirot enjoys a luxurious cruise down the Nile, a newlywed heiress is found murdered on board. Can Poirot identify the killer before the ship reaches the end of its journey?

Actors : Jack Weston, George Rose, Walter Matthau, Elaine May,
Directors : Elaine May,

Henry Graham lives the life of a playboy. When his lawyer tells him one day that his lifestyle has consumed all his funds, he needs an idea to avoid climbing down the social ladder. So he intends to marry a rich woman and - murder her.

Actors : Stefania Casini, Miguel Bosé, Flavio Bucci, Jessica Harper,
Directors : Dario Argento,

A newcomer to a prestigious ballet academy comes to realize that the school is a front for something sinister amidst a series of grisly murders.

Actors : Clive Revill, Pamela Franklin, Roddy McDowall, Gayle Hunnicutt,
Directors : John Hough,

Physicist Lionel Barrett and his wife lead a team of mediums into the Belasco House, which is supposedly haunted by the victims of its late owner, a six-foot-five serial killer.

Actors : Abigail Clayton, Kelly Piper, Joe Spinell, Caroline Munro,
Directors : William Lustig,

A psychopath, troubled by his childhood abuse, loose in New York City, kills young women and takes their scalps as his trophies. Will he find the perfect woman in a photographer, and end his killing spree?

Actors : Faye Dunaway, Tommy Lee Jones, Rene Auberjonois, Brad Dourif,
Directors : Irvin Kershner,

A famous fashion photographer develops a disturbing ability to see through the eyes of a killer.

Actors : Jennifer Warren, Gene Hackman, Harris Yulin, Edward Binns,
Directors : Arthur Penn,

Los Angeles private detective Harry Moseby is hired by a client to find her runaway teenage daughter and he stumbles upon a case of murder and artifact smuggling.