Jealous of the attention his wife Virginia receives at a seaside resort and desiring to know how far her flirtation with Henry Harding has gone, George Conklin returns to New York to hire a detective. He finds a pretty girl in his house and the police identify her as criminal Philadelphia Mary but George tells them that she is his niece that he was expecting; when the police are gone, George learns that her name is Betty McCarthy and makes her agree to spy on Virginia.
| Actor | Role |
|---|---|
 Louise HuffThe Little Intruder | The Little Intruder |
 George MacQuarrieGeorge Conklin | George Conklin |
 Christine MayoVirginia Conklin | Virginia Conklin |
 Johnny HinesBilly Kent | Billy Kent |
 Stuart HolmesHenry Harding | Henry Harding |
 Al HartBob McCarthy | Bob McCarthy |