The FBI investigation that felled Petraeus "started with two women."

The NYT reports that "began with a complaint several months ago about 'harassing' e-mails sent by Paula Broadwell, Mr. Petraeus’s biographer, to an unidentified third person" ("not a family member or a government official"). Checking Broadwell's email, they "stumbled across" her affair with Petraeus.

The NYT source said: “People think that because it’s the C.I.A. director, it must involve bigger issues... Think of a small circle of people who know each other.”

So who is the second woman? Not Petraeus's wife because, we're told, it was "not a family member." But there's a "small circle of people." What woman would Broadwell "harass"?

ADDED: "Associates of Petraeus had received 'anonymous harassing emails' that were then traced to Broadwell... suggesting she may have found their names or addresses in his e-mail."