When a sudden, violent storm sweeps through the valley, a young lamb named Pip is separated from his flock and cast into a world of darkness and fear. But the flock's aging, loyal protector, a wise Border Collie named Barney, refuses to give up.

Ignoring his own weary body and the pleas of his owner, Barney sets out into the treacherous wilderness, following the fading scent of the lost lamb. It's a race against time, a journey of courage, and an unbreakable bond between a dog who has dedicated his life to his flock and a lost lamb who has everything to learn about survival. With predators lurking and a dangerous river blocking the way, will Barney's loyalty be enough to save them both?