A family in financial crisis is forced to sell Lassie, their beloved dog. Hundreds of miles away from her true family, Lassie escapes and sets out on a journey home.

Hard times come for the Carraclough family and they are forced to sell their dog, Lassie, to the rich Duke of Rudling. Lassie, however, is unwilling to remain apart from young Carraclough son Joe and sets out on a long and dangerous journey to rejoin him.

Shell-shocked Barbara must face up to the loss of a dear companion after a tragic accident. Her best friend Klara and husband Torsten devise a plan to thaw Barbara's heart, after she reminisces about the incident, the funeral, and happier times. Will she agree to the suggestions of her nearest and dearest? Can grief turn into hope?

The story of the rough collie hero, Sunnybank Lad.