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Friday and Gannon worked a different beat every week, but they managed to stay in one state. We expect more of Anna Pigeon, the park ranger whose cranky, credible presence has enlivened Nevada Barr’s novels: 11 books, 11 National Park settings. What’s with this woman’s career track? Barr, herself a ranger-turned-mystery-writer, admits she’s taken dramatic license, but “surprisingly little….#Anna goes on more ‘special assignments’ than a real ranger would, but real rangers do go out on many special assignments which take them out of their park.” In Flashback, Pigeon’s post is Dry Tortugas National Park. Will No. 12 bring her to, say, the foot of the Washington Monument? “I haven’t considered that,” Barr replies. “I have set a previous novel in the Statue of Liberty, which is similar to the National Mall. The National Mall is quite wonderful. I haven’t thought about it, but I will now. Good idea.” Offer your plot twists when Barr visits at 7:30 p.m. at Borders, 5871 Crossroads Center Way, Baileys Crossroads. Free. (703) 998-0404. (PMW)