" Presently, as I followed the water down, the steep fall of the valley leveled somewhat, and the ground underfoot changed from moor grass to a dense aromatic carpet of bog myrtle interlaced with heather; and I began to feel for the firmness of every step. Then it dropped again, and the stream plunged after it in a long slide of black water smooth as polished glass under the overarching tangle of hawthorn trees, and rough pasture came up to meet me among the hillside outcrops of black rock, and almost in the same instant I snuffed the faint blue whisper of woodsmoke. "

― Rosemary Sutcliff , Sword at Sunset