Mask of Gentility( Exemplars of Evil, p. 25)
You cunningly hide your true motives and nature behind a facade of camaraderie and gentility.
If you are subjected to a divination spell that normally would reveal your alignment, your alignment registers as neutral. In addition, if someone tries to use the Sense Motive skill to get a hunch about your purpose or nature, she must succeed on a DC 30 check to obtain an accurate impression.
Getting a hunch requires a DC 20 Sense Motive check.