Best Investigation movies of 1970s

Actors : John Karlen, Susan Sullivan, Martin Speer, James Luisi,
Directors : Jeremy Hoenack,

A detective tracks a serial killer through San Francisco.

Actors : Geneviève Robert, Rosa Palomar, Dennis Price, Andrés Resino,
Directors : Jesús Franco,

A lawyer finds out that a young couple convicted of murder was in fact framed for the crime and goes to the prison with the hope of freeing them and learns the events that happened to the two from a fellow prisoner who helped them escape.

Actors : John Considine, Stewart Moss, Cheryl Miller, Barry Coe,
Directors : Eddie Saeta,

An evil immortal magician on a killing spree targets one specific couple in an attempt to prolong his life through soul transference.

Actors : Antonella Antinori, Anna Maria Rizzoli, Mario Cutini, Ray Lovelock,
Directors : Mario Gariazzo,

A reporter and his girlfriend investigate deaths surrounding a hotel where several prominent people go to have sex.

Actors : Michel Galabru, Philippe Noiret, Michel Serrault, Charles Denner,
Directors : Pierre Tchernia,

When he investigates his daughter's disappearance, a bookseller discovers an underground society, living literally under the streets of Paris.

Actors : Sylvia Kristel, Jean-Louis Trintignant, Philippe Noiret, Anicée Alvina,
Directors : Alain Robbe-Grillet,

When Carolina (Anicee Alvina), the daughter of wealthy banker Georges de Saxe (Philippe Noiret), is reported kidnapped, it is upsetting to him even though he knows it isn't true. The ...

Actors : Julien Guiomar, Jacques Perrin, Eva Simonet, Paul Barge,
Directors : Paul Vecchiali,

Unhappy women are being murdered by Emile (Jacques Perrin), a psychotic young man suffering from the delusion that his acts are mercy killings. The detective (Julien Guiomar) assigned to ...

Actors : Philippe Lemaire, Robert Woods, Emma Cohen, Françoise Brion,
Directors : Jesús Franco,

A nightclub singer is haunted by the ghost of her late father. The dead man summons her through a mirror, forcing her to commit a series of violent crimes.

Actors : Ann Wells, Ramon Gordon, Kelley Swartz, Bo Brundin,
Directors : Kent Bateman,

Poor artist gets eye gouged out while committing a robbery. When his eye heals, he goes on a killing spree and cuts out women's eyes with a spoon.

Actors : Howard Ross, Irina Demick, Pilar Velázquez, Robert Hoffmann,
Directors : Alfonso Brescia,

An investigator is assigned to investigate a man's family after he is found dead only hours after taking out a million dollar insurance policy.

Actors : Vic Christy, Fritz Ford, Mike Mazurki, Jimmy Kane,

Challenge To Be Free captures the excitement of a marathon manhunt through 1,000 miles of the most rugged and beautiful terrain in the Alaskan Wilderness.

Actors : Nick Tate, Michelle Jarman, Elizabeth Alexander, John Waters,
Directors : Ken Hannam,

A teacher discovers one of his students has a rare blood disease, and is drawn into a mystery that culminates in a thrilling climax.

Actors : Renato Aragão, Dedé Santana, Mussum, Vera Setta,
Directors : J.B. Tanko,

Woman hires three clumsy adventurers to rescue her missing archaeologist father, who was trying to find the legendary King Solomon's mines.

Actors : Marcel Bozzuffi, Domenico Santoro, Françoise Fabian, Andrea Balestri,
Directors : Carlo Lizzani,

Mino and Lello, two sons of a worker wrongly accused of murder, try to find out evidence of his innocence and begin to investigate mafia business in Torino.

Actors : Kathryn Walker, William Prince, Jon Cypher, John Marley,
Directors : Ernest Pintoff,

A homicide detective goes after a woman-hating serial killer, who uses knives to murder his victims.

Actors : Michael Williams, Scott Antony, Nina Thomas, Judi Dench,
Directors : Tony Richardson,

As a surprise, two horse owners decide to ride their animals themselves in a steeplechase. But Bill Davidson's horse "Admiral" behaves weirdly, and falls hard after an obstacle. Bill dies ...

Actors : Dave Galluzzo, Chip Greenman, Rich Pemberton, Rick Styles,
Directors : Don Edmonds,

A rock band called "The Clowns" comes under suspicion of murder when several prostitutes are killed by individuals made up like members of the band.

Actors : Holly Woodlawn, Buck Henry, Marshall Efron, Alan Abel,

Driving through New York City in his Sexmobile, Dr. Harrison Rogers of the Bureau of Sexological Investigation, searches out luminary figures in the world of sex.

Actors : John Wood, Tammy Grimes, Farrah Fawcett, Jeff Bridges,
Directors : Lamont Johnson,

A woman's husband is murdered and she and her lover must find the killer or stand accused of doing it themselves.

Actors : Silvano Tranquilli, Luciana Paluzzi, Claudio Gora, Henry Silva,
Directors : Umberto Lenzi,

When a crook gets framed as a drug kingpin, the mob decide to "off" his wife. Revenge is the name of the game, and the manhunt is on!