The Entwining Protocols - Huracan, #1

On a troubled planet orbiting a double star, violent conflict upends the lives of a young man and a young woman. Like the stars in their alien sky, they are doubles. Double the trouble. Double the danger. Jackev's twin brother Encer is dead. Somehow, he's still around. A powerful and controlling insurgent force trains Anith to help Jack with Encer's gnawing presence. She's a twin, too. Twins have special abilities, so she and Jack keep being told.
Special ways to join minds. It's impossible, she thinks. Jack's a twin, I'm a twin, but we aren't each other's twin. The clock is ticking. If Anith and Jack can't find a way to connect-to entwine - the revolutionaries forging them into a double weapon of assassination will be most displeased. The consequences? Most unpleasant. As for Jack's twin Encer.