William Gridley, an American diplomat in London, gets mixed up with his beautiful landlady, Carlye Hardwick. Gridley discovers that she is suspected of murdering her husband and fears he may be next although he has fallen in love with her. Carlye's estranged husband suddenly shows up looking for a fortune in jewels hidden in the Hardwick house. Then during an argument, Caryle accidently makes her husband as dead as everyone thinks. But a witness, who also has designs on the loot, gets her acquitted.