In Arran, Callum has to gather their flock from 4,000 acres of steep, rough hill terrain, while Zara recalls the devastating effects of his quadbike accident on that same ground. In Dornoch, Rob and Emma need the vet's help when a ewe gets into trouble birthing triplets, while Ally and daughter Bethany travel by boat to gather sheep on an uninhabited island to bring them home to their croft on Lewis