Clare, Lady Corven and Sir Gerald Corven are to all outward appearances a happily married upper class British couple. But privately, Lady Clare's husband is physically and emotionally abusive toward her, and one day she can take no more, and walks out of the relationship. Clare books passage on a ship, where she is befriended by a kind and handsome young man, Tony Croom. Although their relationship remains strictly platonic, Tony displays strong feelings for Lady Corven, which are duly noted by a private detective hired by Sir Gerald to keep tabs on his wife. Sir Gerald threatens to paint Clare's relationship with Tony in an unflattering light in court, this being a time when divorce was considered scandalous, especially among England's "privileged" classes.
In a contemporary review, The New York Times wrote, "R. C. Sherriff and James Whale, who distinguished themselves as a team by their skillful handling of the film of H. G. Wells's book, "The Invisible Man", have fashioned a grand picture out of the late John Galsworthy's last novel." More recently, Chris Fujiwara wrote on TCM.com, "One More River was released in August 1934 to great critical enthusiasm, which was not matched by popular interest. The mediocre box-office performance of the film, together with its genteel tone and its detailed concentration on the texture of social interaction, helped doom the film to undeserved neglect. It has rarely been revived and has received little attention from critics or historians, except in the context of auteurist appreciation of Whale's career. One More River needs rediscovery." Interest in Mrs. Patrick Campbell, and her relationship with George Bernard Shaw, can also spark topicality on the film. Film historian William K. Everson considered the film "by far Hollywood's most successful attempt at putting any aspect of England on the screen." Everson wrote: "Perhaps as an Englishman I am nostalgically over-enthusiastic because I have never seen such a convincing and 'right' Hollywood film about England... Perhaps I am also nostalgically enthusiastic because of its pleasing, gentle, civilized reflection of an England that is largely no more"...In its visual style, the film confirms Whale's immense talent, still too little known apart from Frankenstein, The Old Dark House, The Invisible Man, and Bride of Frankenstein. Colin Clive's first appearance, in a series of four shots that showcase his stiff swagger and superior scowl, is as devastating an entrance as any ever accorded a screen villain. The courtroom sequence is an astounding piece of filmmaking, with Whale's elaborately mobile camera accentuating the vastness of the space and setting offthe rich contrasts in acting styles among the participants."