Local author Ellen Byerrum calls her hometown of Washington, D.C., “The City That Fashion Forgot.” But while the District’s deficit may make for stuffy street-style, it also makes it the perfect locale for Byerrum’s “Crime of Fashion” series, a collection of mysteries based around fictional fashionista journo Lacey Smithsonian’s couture crime capers. In Armed and Glamorous, the sixth book in the series, Smithsonian sets her well-coiffed head on a new mystery—the murder of Washington socialite Cecily Ashton—uncovering clues using only her innate sense of fashion pop-psychology. On the surface, the book’s premise reads like Sex and the City meets The Da Vinci Code, but—stay with me here—this precious P.I. story has got some tricks up its immaculate sleeves for both the divas and the disheveled of D.C. Byerrum, for one, knows her stuff: Not only is she a Beltway journalist herself, but she’s also got fabulous hair. Byerrum discusses and signs copies of her work at 6 p.m. at Olsson’s Books & Records, 2200 Crystal Drive, Arlington. Free. (703) 413-8121.