Frederick Hilton, a stock broker, is on the verge of failure, but he keeps his sad secret to himself. His wife, a lover of all the gleam and glitter of life, further imperils him by her extravagance. She has a gorgeous set of jewels she desires to have expensively reset. He asks her to defer this for the present. She is perverse and impetuous, and does not understand such delay. He leaves the door of the private vault in their palatial residence open. She has just taken out the jewels and steps back into the vault to escape him, when he returns and closes the door with a bang, unwittingly imprisoning her. During the day the market swings in his favor, and he recovers from the cowardly thought of desperate suicide, to find his fortune safe. When he comes home, elated with the good news, he cannot find his wife, and at once jumps to the conclusion that the butler has made away with her in order to get the jewels. As they are struggling at the door of the vault, he hears a faint tapping on the inside. During the rush of the day he has lost his memorandum of the vault combination. Spurred by desperation, he secures the aid of two safe blowers, who finally open the iron-room and the imprisoned woman is released, bringing new hope and happiness to his arms.