At a hunting lodge retreat, banker Hubert Kingery announces to five fellow officers that one of them has forged documents and embezzled $500,000.

Kingery's daughter Gwen does not agree and asks for help from her aunt's nurse, Sarah Keate who suggests her detective boyfriend, Lance O'Leary, for the case.

He tricks her into revealing this and learns that she stole Gerald's toupee, which has the combination of his safe written inside it.

Lance discovers that a gun on the wall, hung as a decoration, has been rigged to fire if the office door is bolted.

When Lance starts to arrest him, Barre socks him and holding a gun on the roomful of people, flees.

Lance found a paper in Kingery's safe accusing Barre of forging some securities so he could lavish the proceeds on Helen.

The film was released theatrically by Warner Brothers in May 1938 as part of the Clue Club mystery series.

[1] Frank S. Nugent gave the film a short-but-not-sweet review in The New York Times on June 29, 1938: “Picking our way gingerly past the three corpses cluttering up the Palace's "Mystery House," we come to that scene in which the chief lurker-about ransacks the detective's luggage, takes his gun and with its butt-end knocks the sleuth cold as he opens the door.

After a charitable interval, the detective regains consciousness, seizes his assailant—who is still clutching the tell-tale weapon—and demands an explanation.