Page "The Big Clock (film)" Paragraph 4

Later that night, Janoth spots a man leaving York's apartment, but does not get a clear enough look at him to see that it is Stroud.

Although Stroud's evening with York had ended platonically, Janoth assumes otherwise, leading to a quarrel which ends when he murders her.

Janoth determines to locate the man he had seen leaving the apartment and then frame that man for the crime.

Ironically, Janoth re-hires Stroud to lead the effort to find the man.