Once in England, an exhausted, hungry Lassie collapses outside a cottage owned by Dally and Dan'l Fadden. After traversing a swampy area, Lassie then swims a river into England. The next day, she resumes her journey and is almost killed by two shepherds, who suspect her of killing their sheep. Lassie runs and runs until a rain storm forces her to take shelter.

Priscilla opens the gate and allows Lassie to escape, then comments to her astounded grandfather that the collie is headed south, toward England. Hynes is so rough with Lassie, however, that the dog breaks away from him and dashes to the front gate, where Priscilla and the duke are standing. The duke soundly chastises Hynes and orders him to walk Lassie around the estate's grounds. Later, in Scotland, Priscilla notices that Hynes has chained Lassie inside her pen and complains to her grandfather. That evening, Sam lectures Joe on the importance of honesty and informs his son that the duke is taking Lassie hundreds of miles away to Scotland for a dog show and will be staying there indefinitely. At the duke's estate, Joe is somewhat cheered by the presence of Priscilla, the duke's sympathetic young granddaughter, who promises to give Lassie special care. This time Joe runs off and hides with Lassie, but the two are quickly found by Sam, who insists that Joe return Lassie to the duke in person. Lassie soon escapes a second time by jumping over the pen's fence. Although Joe is overjoyed to see Lassie, his parents know that they must return her to the duke and reluctantly hand her over to Hynes. The next day, however, Lassie digs her way out of her pen and shows up at Joe's school at the usual time, four o'clock. Lassie, meanwhile, is taken to the duke's kennels, where she is locked in a pen by Hynes, the cruel, Cockney dogkeeper. When Sam and his wife Helen finally break the news, Joe is inconsolable. Unaware that his poor, unemployed father Sam has been forced to sell his beloved collie Lassie to the Duke of Rudling, young Joe Carraclough, of Yorkshire, England, is immediately concerned when the dog fails to meet him, as usual, after school.

Lassie come home knight