Best Investigation movies of 1964

Actors : Elizabeth Shepherd, Alexander Davion, Barbara Shelley, William Sylvester,
Directors : Lance Comfort,

When the wife of a blind composer discovers that her husband will cut her out of his estate, if he discovers that she is having an affair with a young artist, she and her lover plan to commit the perfect murder.

Actors : Diana Martín, Bernard Price, Claude Dantes, Tony Kendall,
Directors : Gino Mangini,

A serial killer called "The Hyena" is finally caught and eventually hanged. However, his body disappears before it can be buried, and soon thereafter dead bodies start turning up in a small village.

Actors : M.G. Ramachandran, Saroja Devi B., Sennalkudi Lakshmi, Ashokan,
Directors : P. Madhavan,

Maran, a police officer, grows up with the belief that his father was killed in a tragic accident. However, when he sets out to investigate a case, he learns that his father leads a terrorist group.

Actors : Sabine Sesselmann, Elga Andersen, Heinz Drache, Ralf Wolter,
Directors : Manfred R. Köhler,

A private detective finds the limp body of a young Chinese beauty in his office, shot with his own gun.

Actors : John Hoyt, Arlene Martel, Elisha Cook Jr., Bob Kelljan,
Directors : Antonio Santean,

Two detectives investigate the murder of a local businessman by a mysterious woman.