Or very hell, according to 19-year-old Celia Dent, the narrator of “Evil Genius,” Claire Oshetsky’s noir delight of a novel. Set in the Bay Area in 1974, “Evil Genius” alludes to Hearst, Watergate and other flashpoints of the era as Celia seeks freedom beyond the narrow cage of her life. Now older, she peers back some 50 years to a moment of transformation.