This book is story of the Laura Wing, an impoverished American girl, is visiting her sister Selina Berrington in London. Selina's husband Lionel, boorish and often drunk, is preparing to divorce his wife for her adultery with Charlie Crispin. Laura challenges Selina about her affair and doubts Selina's protestations of innocence. Lady Davenant, an elderly friend of the family, counsels Laura not to take her sister's marital troubles so hard. Laura meets a pleasant but boring American named Wendover, who becomes a suitor. Eventually, after a tempestuous and (for the reader) entertaining scene at the opera, Selina leaves her husband and goes to Brussels with Crispin. Laura spurns Wendover's marriage proposal and pursues her sister to Brussels, where she accomplishes nothing. Laura finally goes back to America, where Wendover follows her though there is no assurance as to how their future will play out. The story ends with a reminder that the case of Berrington v. Berrington and others is upcoming in the courts.