The Sphinx is a 1933 American Pre-Code mystery drama film directed by Phil Rosen. The film was remade by William Beaudine as Phantom Killer in 1942.

Plot
A man comes out of the office of “Garfield Investment Company”. He meets the janitor in the stairs and asks him for a match, and then what time it is. “It’s nine” the Italian-American janitor Luigi Bacciagalupi (Luis Alberni) answers and wants to know from which apartment he came out. The man leaves without answering. Short after the janitor finds a dead man in the office of “Garfield Investment Company”. Newspaperman Burton (Theodore Newton) from the Chronicle is there to talk with the inspector. Before he can see him he talks with the watching police officer, and after a while, realizes that the Garfield Investment Company just that morning went bankrupt. “Another broker went down the flush”. The janitor recognizes on the police records the man who came out of the office, Mr. Breen. During the trial he sticks to what he has seen and what he has heard, though two different doctors testify that Mr. Breen is deaf and mute since birth.

Young chronicle newspaperman Jerry Crane, in love with his good-looking girl colleague, has a feeling that Breen is a strange guy and tries to convince her not to go for interview to his house. Meantime a young broker tells him he has a hint, if he gets enough money for it. Breen comes to see the young broker before at half past eight the Burton comes to his house. A second time Mr. Breen asks for the time after seeing his victim. The puzzling case has the parallel love story of the two newspaper-people of the Chronicle. While Burton, who wants to marry Crane, is skeptical about Breen, Crane is fascinated, and dedicates him a series of articles. When Inspector Riley thinks he saw Breen hearing the playing of the piano when they are in his house, the next morning a third dead man is on the list.

Cast
Lionel Atwill as Jerome Breen
Sheila Terry as Jerry Crane
Theodore Newton as Jack Burton
Paul Hurst as Detective Terrence Aloysius Hogan
Luis Alberni as Luigi Baccigalupi
Robert Ellis as Inspector James Riley
Lucien Prival as Jenks, the Butler
Lillian Leighton as Mother Werner
Paul Fix as Dave Werner
George ‘Gabby’ Hayes as Det. Casey