Everyone expected big things from Ariel Thompkins. Wasn't she the girl who'd roped her friends into one madcap adventure after another, who'd met the challenge of losing both parents before turning eighteen, who'd gone on to graduate summa cum laude from UCLA? So how did this livewire end up delivering the day's mail for the U.S. Postal Service, hunkering down each night with her half-blind cat in front of the TV, ruminating over the width of her...