A young girl heals from grief and loss in the snowy Highlands of Scotland, with the help of her loyal, trusting rescue dog.

Clova's life changes forever when her mother, who was a search and rescue volunteer, dies tragically in an avalanche. Her grieving father withdraws and life at home feels lonely, until the day she meets Border Collie Tatty, a shy and frightened dog who Clova helps make bright-eyed and boisterous again.

She begins to train Tatty as a search-and-rescue dog and when two local boys go missing on the moor, Tatty and Clova spring into action to track them down and save the day. But Dad is furious when he finds out Clova has been on the mountain, and sends Tatty
away. Clova is heartbroken.

On the first day of spring, the sudden rise in temperature after a cold snap and heavy snow causes an avalanche on the mountain - and Clova's dad is up there! The Search and Rescue team - plus Clova and Tatty - scramble onto a helicopter for a dangerous rescue mission in the growing dark - can they find Dad and save the day?