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Ever since there were three people around to fuck one another, the bizarre love triangle has been a standard of both classical and daytime drama. With The Worst Thing I’ve Done, Ursula Hegi adds another untidy triplet to the mix. In Hegi’s 11th book, Jake’s in love with Annie, Annie’s married to Mason, and Mason’s obsessed with both of them. Plus, the three are raising an orphan together, and Mason’s recently hanged himself (the story is told in flashbacks). Like Homer and New Order before her, Hegi tells the story of a triad that gets pushed to its breaking point. But The Worst Thing I’ve Done is less about the inevitable transgression (it involves a sauna) than what happens next. Hegi unravels the lives of three dangerously close friends with a delicate urgency that grants new relevance to the age-old conflict. Hegi discusses and signs copies of her work at 7 p.m. at Politics and Prose, 5015 Connecticut Ave. NW. Free. (202) 364-1919.