Star wants nothing more than to be a sheepdog, just like her mum. But everyone says she's much too fast and eager, and when she fails her Level One Bo Peep badge, Star begins to worry that she'll never be good at anything at all. One dark and stormy night, a lamb goes missing on the mountain. Star races off into the blizzard to find it, but she soon discovers that the lamb isn't the only one who needs her help. A hiker has broken his leg and desperately needs her help too. Star knows she's got to do something - and fast. Can she save the injured hiker before it's too late?