Vampire Diaries: The Salvation: Unspoken: Book 12

An epic battle looms - one that will not only determine Elena's own fate, but that of her entire world. Since her true love Stefan was staked through the heart, everything has changed for Elena. Stefan was hunted down by a scientist who has created a new race of genetically-engineered vampires to take over the paranormal world. Intent on eliminating all the natural vampires left on earth, Damon is the scientist's next target. It's a race against time to find the kryptonite of these strange creatures, before they hurt everyone Elena loves.