Whispers of Eternity by Em Petrova

“Her blood rose to him, as strong as magnet to steel.”

After Lillian and Nathan are linked by an immortal bond known as the Calling, they’re caught in its chokehold.
As the linked lovers come face to face, they find themselves embroiled in the puzzling events surrounding Lillian’s delivery into immortal life, and they must find the source of the bond that will inevitably bind them—or end them.
Will love stand the test of time and finally bring her into the arms of her immortal mate? When it comes to eternity, no sacrifice is too high.