When technophobic widow Tawny Lindholm receives a baffling new smartphone as a gift, a dashing stranger helps her navigate its mysteries. But while romancing her, Kahlil Shahrivar is actually a terrorist who drags her into a plot to sabotage the power grid by cyber-attack on Montana’s Hungry Horse Dam. Soon the Feds are chasing her, and her family is in jeopardy. Tawny must find a way to turn the instrument back on the devil himself. Otherwise, when the lights go out, she dies.