Broken Promises - Shattered Vows Trilogy

I'm not a good man, no matter what you may think. I'm selfish, stubborn, I've killed without remorse, and when it came to family, the only person I gave a damn about was my sister, until I met her. She was unlike anyone I'd ever known, determined to make her way through life on her own terms. Facing painful revelations, she stood strong in the face of adversity, and never backed down from the demons that wanted to drag her into a nightmare of their making.
She turned her pain into power and when she showed her inner strength, I knew she was meant to be mine. I will go to any lengths and fight whatever battle is needed to save her. I refuse to fail, even if it means destroying everyone and everything in my path. What happens when we discover who's been pulling the strings, filling her world with darkness?Will she survive the dark nightmare and return to me, or will the madness drag her down into the depths of depravity, damning her forever?