"How would they be able to tell." Theo said, more hissed, angry and bitter and something else much darker than Dark Lords, Marks, Eaters, whatever, something far older and much more personal than that.
There was that brief twist of self-immolating power from Theo, but it was gone in the next eye blink and he was back again, but not relaxed. "He's very clever." he said, his voice subdued now. "My father."