The Mysterious Miss X is a 1939 film directed by Gus Meins and starring Michael Whalen, Chick Chandler and Mary Hart.

[1] Out of work when their play about a police inspector closes, actors Keith and Scooter are traveling by bus when they run out of money to go farther.

A new suspect emerges in the form of Pratt's secretary, Charlie Graham, when $5,000 in cash is found in his possession.

Graham is arrested and daughter Julie calls family attorney Clarence Fredericks to represent him.

They resist a request for their help until the attractive Julie also asks, as does Alma Pratt, the dead man's widow, who offers them a fee to investigate.