You work both sides of a very spiky fence; one of these days, you’re gonna get stuck on it. Perhaps you’re a Syndicate spy in the Ecstatic Cult, or an Etherite working with Iteration X. In the days of the Disparate Alliance, you might belong to a Tradition while ferreting data to your true Craft. Eventually, this dangerous game will catch up with you. Make plans, establish contingencies, and try not to get yourself perished!

Obviously, this Flaw must be kept secret from the other characters in your group. For extra drama, try to keep it hidden from the other players, too…