A family in Yorkshire, England, reluctantly sells their cherished collie, Lassie, to cover their expenses during a period of financial hardship and high unemployment. The son is heartbroken by the loss of his loyal friend, who waited for him every afternoon after school. Lassie is purchased by a wealthy duke and taken to Scotland. Nevertheless, she escapes and embarks on an incredible journey of roughly one thousand miles back south to her home. Her trek involves crossing difficult natural barriers like rivers and snow drifts. Along the way, Lassie meets both friendly and unfriendly humans and animals, and she endures injuries. Her unwavering determination, perseverance, and loyalty culminate in a reunion that hints at brighter days ahead for Lassie and her beloved family.