The Floor Above.

English sleuths Grace Burton and Stephen Pryde are in love, but when Stephen inherits wealth and a title, he does not tell Grace, fearing that she will stop loving him. Grace provides support for her sister Stella Ford, whose husband is frequently away on business trips, so Stephen, hoping to alleviate Grace's financial burden, pays all of Stella's debts and provides her with an allowance. When Grace learns of the arrangement, she is hurt that he did not confide in her. Stella lives in a building occupied by a wild crowd. In the flat above her lives Netta, who has numerous boyfriends, including Jerome, an older man, and Bartlett, a young fop. One evening, the rivals mistakenly enter Stella's apartment and in an ensuing fight, Jerome kills Bartlett.