Never Let Me Go (Book 8, Vampire Diaries)

Nicola Salvatore never wanted to unleash the Huntress inside of her. But in the last book, Rayna Cruz cast a spell that made it impossible to keep the Huntress at bay. In the last book, Nikki tried to kill her ancestors Stefan and Damon, but never wanted to. She is trying everything she can to not kill her family and friends.
But what happens when the Siren sets her sights on Nicola? Will she lose control and fall prey to her spell?
And what if the Siren kills her one last true connection to her humanity... her sister Sarah?