Life is tough for Joe Carraclough, a Yorkshire miner's son, who faces bullying at school and is forced to part with his beloved collie Lassie when his father sells her to The Duke. Despite numerous attempts, Lassie keeps returning, and the Carracloughs must repeatedly return her to the Duke's estate. Eventually, the Duke moves to the Scottish Highlands, and Lassie makes a daring escape, facing many challenges as she attempts to find her way back home, with a miracle needed by Christmas.

Lassie
A family pet, separated due to financial hardship, dares to escape and undertakes a daring quest to reunite with her loving original family.