I need suggestions for building a master spy.
20th level, everything 3.X and PF allowed, needs to be a doppelganger (or alternatively a changeling, which I assume is the more optimal choice).
Can use spells, but only as support for her spying skills/abilites, not as the primary focus.
What I'm looking for are feats, abilities and items that'll help her in infiltrating highly secure places, gathering vital information, impersonating important individuals, etc., you know, the usual super spy stuff. Doesn't have to be great at combat, competent against mooks is enough.
