"Vivid, visceral, and sexy--I loved it."--JEN DEVON, author of Bend Toward the Sun, on Johanna Porter Is Not SorryA brilliant mind needs a strong heart.Mathematical genius Dr. Meg Brightwood has just completed her life's work--a proof of a problem so impenetrable it's nicknamed the Impossible Theorem.Reclusive and burdened by anxiety, Meg hadn't been taken seriously before. Now everyone wants to get their hands on what she alone possesses--especially...