Another child of mystery and another river journey – this time up the Rheidol to its source on Plynlimon Mountain, which is where foster-child Ryan Lewis (the Mad Dog Moonlight of the title) discovers the power of his real name. It’s the story of a traveller-child, picked up lost on a lonely road with nothing from his past but a silver-topped walking cane upon which is engraved a secret word. Mysterious deep silences lay inside Mad Dog, with hints of buried trauma. What happened to his old life? And what about his parents – have they really abandoned him and, if not, what‘s happened to them? Only when his path crosses that of a pair of mysterious adventurers whose interest in Plynlimon seems to match his own, do things begin to fall into place. A final journey takes place, and not only are Mad Dog’s secrets given up but Plynlimon’s secrets too.