"What I fail to understand," says Susan, with some slight reluctance - she hadn't meant to ruin the tone of the conversation - is why he decided to give up entirely on Narnia and let it crumble and burn and drown - I believe in that very order - and take my entire family with it. Including Mother and Father, who didn't even know it existed. If he was so dead-set on collecting them all, couldn't he have waited for them to arrive in the natural way?" She's thinking about Edmund again, and how Lucy's description of Aslan's country seems as antithetical to his interests as it is to Susan's own.
no subject