Since coming to London, Bella Manningham feels she has been losing her reason. Her husband, Jack, is threatening to commit her to an asylum, “like your wretched mother before you”. When Rough, who claims to be an ex-detective, visits, he gives her more cause to doubt her reason. He believes her respectable husband is actually a thief and murderer. Slowly building his proof, Rough convinces Bella that she is perfectly sane and that her husband must be brought to justice.
This 1938 play was turned into a film in 1944 starring Ingrid Bergman and Charles Boyer.