Best Investigation movies of 1971

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 : Jean Anderson, Patricia Neal, Nicholas Clay, Pamela Brown,
Directors : Alastair Reid,

Effective psychological love story with a macabre twist not found in the original Joy Cowley novel. The dreary existence of middle- aged spinster Maura Prince takes an unexpected turn with ...

Actors : Yvonne Furneaux, Ely Galleani, Ugo Tognazzi, Vittorio Gassman,
Directors : Dino Risi,

An obscure Italian magistrate suspects that a well-known industrialist commited murder, and decides to investigate him, and bring him to court, whatever it takes. But - will the magistrate ...

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 : Jackson Beck, Pamela Gruen, Devin Goldenberg, Allen Garfield,
Directors : John G. Avildsen,

Private detective takes on a case and gets mixed up in murder, sex and blackmail.

Actors : Jean-Louis Trintignant, Sacha Distel, Dominique Sanda, Carla Gravina,
Directors : Philippe Labro,

A strange series of murders are being committed in Nice on the French riviera. The commissionaire Carella is in charge and tries desperately to find a missing link between all of these ...

Actors : Leslie Caron, Mitchell Ryan, Alex Dreier, Warren Oates,
Directors : Paul Magwood,

A hardboiled aging private eye is hired to find and protect a missing government witness sought after by the gangsters. The witness is a beautiful French woman and even the cops can't be trusted. The case is tough, but so is Chandler.

Actors : Arthur O'Sullivan, Anton Diffring, Luigi Pistilli, Dagmar Lassander,
Directors : Riccardo Freda,

In Dublin, a young woman is brutally murdered in her home by a maniac that throws acid in her face and then slits her throat with a razor. Her mangled body is later discovered in the boot ...

Actors : James Mason, Curd Jürgens, Jean Seberg, Stephen Boyd,
Directors : Romain Gary,

Interpol investigates the freelance killings of drug and porn peddlers.

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 : 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 : Yvonne Nielson, Robert Winston, Katherine Henryk, Vic Diaz,
Directors : Newt Arnold,

A sex-crimes specialist from New York travels to the Philippines to help his friend, a Manila homicide detective, solve a series of murders.

Actors : Asha Parekh, Aruna Irani, Mehmood Jr., Jeetendra,
Directors : Nasir Hussain,

Sunita is a young woman who ends up married to the wrong man, Rajan. Thinking that he has conspired with his girlfriend, Monica to murder her, she runs away to find an old friend of her ...

Actors : Midori Fujita, Shin Kishida, Chôei Takahashi, Sanae Emi,
Directors : Michio Yamamoto,

A doctor investigates the murders of several women at a lakeside resort. His investigation leads him to believe that a vampire is responsible for the murders. He sets out to track the vampire down.

Actors : Miranda Campa, José Luis López Vázquez, Carroll Baker, Michael Craig,
Directors : Eugenio Martín,

A wealthy Englishman finds his third wife dead. After the police discover that his first 2 wives had also died suddenly, an investigation is lead. Meanwhile, a new neighbor moves in and she seems to become very interested in Arthur.

Actors : Donn Greer, Sebastian Brook, Gray Daniels, Mady Maguire,
Directors : Eric Jeffrey Haims,

A man commits a series of murders due to his dual personalities and his zodiac birth sign.

Actors : Anjanette Comer, Joanne Dainton, Keith Barron, Chad Everett,
Directors : Sidney Hayers,

Insurance investigator must find out who is setting fires. Along the way he meets and works with a beautiful newspaper reporter and falls in love.

Actors : Alberto de Mendoza, Janine Reynaud, Erika Blanc, George Ardisson,
Directors : Bitto Albertini,

A gangster seeks those who killed his brother. A series of murders follow.

Actors : Helena Rojo, Jorge Luke, Cameron Mitchell, Isela Vega,
Directors : Alberto Mariscal,

A vengeful widow hires a professional killer to train her son so that he can hunt down and kill the men who murdered her husband. The quest for revenge soon becomes an obsession.