Re: Covert Affairs (Piper Perabo, new USA series) - Discussion & Spoil
Well, she's a CIA agent who works mainly in Washington on domestic cases (which is a contradiction in terms, I think, but this is fiction). And the Smithsonian is a major Washington institution. We've already seen ways in which it can be a useful cover for her, such as allowing her to spy on a US Senator by pretending to be the consultant assigned to update the decor in his office.
If anything, the implausibility is the fictional conceit that a CIA agent's life is all about adventure and gunplay. In reality, most CIA work is probably about paperwork, surveillance, computer searches, talking to people, paying people off, things like that. So in real life, an art appraiser would probably be as good a cover as any, since such a person would have an excuse to travel a lot, deal with shipments to and from foreign countries, interact with wealthy and powerful people, etc.
For that matter, so far, most of Annie's nominal missions haven't been supposed to be about action and gunplay. The SOP for this show seems to be starting off with her assigned to what should be a fairly simple matter -- listening to random walk-ins who are probably mostly kooks, befriending someone whose sister the CIA wants as an asset, making a routine briefcase swap at an airport, convincing a retired agent to come in and consult, etc. -- but having things go wildly off-plan so that she gets dragged into a more intense situation than expected. So I don't see any incongruity in her cover, because it fits the level of intensity that her job is supposed to have. The contrivance is simply that so many things go wrong and drag her deeper into danger than she was intended to go.