Atonement - Characterize Paul Marshall

To me, Paul Marshall seems kind of creepy. To begin with, while the children are playing in the nursery, he enters and begins to flirt with Lola who is a very young girl. Paul Marshall is way older than Lola and it is so wrong that he is flirting with her. For the rest of the novel, Paul doesn't play a huge par in the story except for the fact that he always seems to be the guy who just sits back and observes. On the night that the twins go missing and the night of the horrible incident between Lola and supposedly (not really) Robbie takes place. During this, Paul is no where to be found and this leads me to think that maybe Paul was the one who raped Lola, not Robbie. Again, hopefully as I read more of the novel, all the truth will be revealed and maybe my prediction will be correct because we all know that it wasn't Robbie, so who else could it be?