Oh! Er... it is? [He looks down at the book and frowns.] Then, that must be why I haven't read it yet. If it's just been lying around, I must have started it and then forgot abou-

[Ion froze. He forgot about it. It all made sense now. He must have read the book and then forgotten how it went! This was rather extreme memory-loss compared to his slip-ups this morning. And the shock of realizing all of this is starting to show in his expression.]