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OPEN CLASSIC CINEMA · 335

The Sphinx

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Synopsis

A witness identifies a businessman as the man he heard speaking near a murder scene. Medical testimony insists that the suspect cannot hear or speak, leaving the case suspended between apparently incompatible facts. Two newspaper reporters pursue the puzzle while further deaths make their investigation increasingly dangerous.

Cast

Reception and legacy

The central mystery proved reusable: William Beaudine directed another version as Phantom Killer in 1942. This earlier treatment belongs to the compact mystery productions associated with Monogram in the years before Hollywood's Production Code was strictly enforced.

Sources and availability

The synopsis and editorial text were written for this collection. The references below were cross-checked to identify the film and its copy; each editorial section identifies its reference.

Work catalogued as public domain in the United States.

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Availability checked on September 10, 2026.

Photograph credit

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