Natalie has to fill an order for 20 pounds of fleece. But when Natalie discovers her sheep flock could potentially be infected with a deadly virus, she must immediately test her sheep to weed out sick animals and keep the disease from spreading. With the threat of wiping out her flock and threatening her main source of profit -- sheep's wool -- Natalie must decide the fate of the sick animals. Meanwhile, Natalie's son, Connery, returns from England with Natalie's new herding dog, Lad.