The apple which tempts my characters is the one that will remove the knowledge of good and evil. I suppose it's something of a reversal of the conventional Eden story: Freedom of thought is perhaps the greatest good, and needs to be fought for and sacrificed for.
He said, speaking more to himself than to me: 'It was knowledge I sought. Knowledge which is clean and pure, far above the cheating and deceiving in which most men spend their lives.' And do you not find it,' I asked, 'this knowledge which you prize?' In part,' he said. 'I find other things, too. Things I do not desire but must accept. There is still cheating and deceiving.