Best Investigation movies of 1973

Actors : Sissy Spacek, Ramon Bieri, Warren Oates, Martin Sheen,
Directors : Terrence Malick,

An impressionable teenage girl from a dead-end town and her older greaser boyfriend embark on a killing spree in the South Dakota badlands.

Actors : Al Pacino, John Randolph, Jack Kehoe, Biff McGuire,
Directors : Sidney Lumet,

An honest New York cop named Frank Serpico blows the whistle on rampant corruption in the force only to have his comrades turn against him.

Actors : Michel Auclair, Alan Badel, Terence Alexander, Edward Fox,
Directors : Fred Zinnemann,

A professional assassin codenamed "Jackal" plots to kill Charles de Gaulle, the President of France.

Actors : Roger Moore, Clifton James, Jane Seymour, Yaphet Kotto,
Directors : Guy Hamilton,

007 is sent to stop a diabolically brilliant heroin magnate armed with a complex organization and a reliable psychic tarot card reader.

Actors : Britt Ekland, Edward Woodward, Christopher Lee, Diane Cilento,
Directors : Robin Hardy,

A police sergeant is sent to a Scottish island village in search of a missing girl whom the townsfolk claim never existed. Stranger still are the rites that take place there.

Actors : Edward G. Robinson, Leigh Taylor-Young, Charlton Heston, Chuck Connors,
Directors : Richard Fleischer,

In the world ravaged by the greenhouse effect and overpopulation, an NYPD detective investigates the murder of a big company CEO.

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 : Clive Revill, Pamela Franklin, Gayle Hunnicutt, Roddy McDowall,
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 : Joe Don Baker, Felicia Farr, Andrew Robinson, Walter Matthau,
Directors : Don Siegel,

A man, his wife, and their friend, stage a bloody bank robbery, unaware they are stealing money from the Mob.

Actors : Sterling Hayden, Elliott Gould, Nina van Pallandt, Mark Rydell,
Directors : Robert Altman,

Detective Philip Marlowe tries to help a friend who is accused of murdering his wife.

Actors : Sean Connery, Vivien Merchant, Trevor Howard, Ian Bannen,
Directors : Sidney Lumet,

A burned-out British police detective finally snaps while interrogating a suspected child molester.

Actors : Paul Sorvino, Trish Van Devere, John Dehner, George C. Scott,
Directors : Mike Nichols,

Dr Jake Terrell, who has been training a pair of dolphins for many years, has had a breakthrough. He has taught his dolphins to speak and understand English, although they do have a limited...

Actors : Victor Arnold, Roy Scheider, Jerry Leon, Tony Lo Bianco,
Directors : Philip D'Antoni,

A tough detective who is part of an elite New York City unit is trying to find out who killed his partner, but uncovers a plot to kidnap mobsters for money.

Actors : Peter Cushing, Christopher Lee, Michael Coles, William Franklyn,
Directors : Alan Gibson,

In London in the 1970s, Scotland Yard police investigators think they have uncovered a case of vampirism. They call in an expert vampire researcher named Van Helsing (a descendant of the ...

Actors : Ben Johnson, Rod Taylor, Ann-Margret, John Wayne,
Directors : Burt Kennedy,

A gunhand named Lane is hired by a widow, Mrs. Lowe, to find gold stolen by her husband so that she may return it and start fresh.

Actors : Dawn Addams, Tom Baker, Terry-Thomas, Michael Craig,
Directors : Roy Ward Baker,

An anthology of five horror stories shared by five men trapped in the basement of an office building.

Actors : Bruce Dern, Louis Gossett Jr., Albert Paulsen, Walter Matthau,
Directors : Stuart Rosenberg,

In San Francisco, one victim in a mass murder is a police detective. His partner and a new partner investigate in the city's seamy side.

Actors : Vonetta McGee, Neda Arneric, Richard Roundtree, Frank Finlay,
Directors : John Guillermin,

P.I. John Shaft is recruited to go undercover to break up a modern slavery ring where young Africans are lured to Paris to do chain-gang work.

Actors : Jaya Bhaduri, Om Prakash, Pran, Amitabh Bachchan,
Directors : Prakash Mehra,

A tough and honest police officer clashes with a crime boss who, unbeknownst to him, happens to be his parents' murderer.

Actors : Gloria Hendry, Fred Williamson, Margaret Avery, Julius Harris,
Directors : Larry Cohen,

A gangster in Harlem must rescue his ex-wife, who has been kidnapped by the Mafia.