When Callum and his friends find Lona on Callum's farm then try to chase her back into the village. But Lona runs from them up into the hills. It is late and dark and snow lies in the mountain gullies. Worried for Lona's safety, Callum follows to find her shivering with cold but refusing to leave. She is guarding a secret hidden in the forest above the dark waters of the loch...