In Darling Companion, Beth (Diane Keaton) saves a bedraggled lost dog from the side of the freeway on a wintry day in Denver. Struggling with her distracted, self-involved husband Joseph (Kevin Kline) and an empty nest at home, Beth forms a special bond with the rescued animal. When Joseph loses the dog after a wedding at their vacation home in the Rockies, the distraught Beth enlists the help of the few remaining guests and a mysterious young woman (Ayelet Zurer) in a frantic search. Each member of the search party is affected by the adventure, which takes them in unexpected directions - comic, harrowing, sometimes deeply emotional and ultimately towards love.