Rossmiller succeeds by exploiting a fundamental flaw in al Qaeda’s famously decentralized organization. The absence of a strict hierarchy makes it pretty easy for a cunning person to mix among the terrorists. So she poses as a potential al Qaeda soldier looking for like-minded comers. She creates multiple characters and uses her older and more respected personae to invite the new ones into private forums. There are other self-taught counterterrorists like her, but they tend to translate and discuss, lurk and report. Rossmiller works the terrorism boards as if she were playing a complex videogame. Her characters come complete with distinct personalities and detailed biographies that are as richly conceived as any protagonist on an HBO series. She keeps copies of everything, time-stamps files, and takes screenshots. She has an Excel spreadsheet that details the 640 people with whom she has had contact on these boards since 2002.