Teen prodigy Josephine Rivers has a nearly supernatural ability to see the world through a mathematical lens---to even, at times, predict the future. When she is kidnapped and forced to use her talent to shore up a criminal empire, Jo deems her gift a curse--until she meets a fellow captive, Red, who teaches her to harness her true potential & helps her escape. Before he dies, Red makes her vow to right his wrongs. But Jo has a vow of her own until an off-limit boy and a crisis stand in her way.