A Blonde for a Night (1928)

Myra Martin, in love with her boss, divorce lawyer Leonard Gilbert, attempts to save her younger sister, Helene, from philandering married man Huntley Sheldon. However, Helene elopes with her best boyfriend and returns to find Huntley molesting Myra. When Huntley's suspicious wife, Juanita Sheldon, shows up with empty-headed private detective Botts, everything gets straightened out.