Everyone gets old, even witches and wizards. Their backs get stiff, their feet get sore, and their brains go and live far, far away. Not even Nerlin Flood, the King of Transylvania Waters, is immune to the curse of old age. The rest of the family have noticed that Nerlin is slipping into total Doolallyness—including having an invisible friend called Geoffrey who warns him not to eat broccoli because it will give him global warming. Only the Old Crones can help Nerlin, so his family travel high up into the mountains to visit them. Will the wisest witch of all, Gruinard, be able to cure him, or is Nerlin doomed to spend his twilight years talking to the wall, wearing a crooked jacket?