The Amber Torch - The Altered Elite Series, #1

Why are people in Josephine's town dying? Jo doesn't know, but she's worried she's next. Especially with the strange things happening within her, keeping her up at night.changing her. Jo feels out of control, but when death hits close to home, she finds herself being comforted by Mark, the last person she'd expect to be there for her and the only person she's ever wanted. As they search for answers, Sandy, a new student at her high school, and his sister Gio thrust themselves into her life.
Left scrambling to cope with the growing darkness within her she soon learns the impossible truth. She's somehow connected to the murders, to a secret organization gunning for her and something lying deep within a cave in the surrounding mountains. While fighting unexpected feelings for Sandy and before anyone else gets hurt, it's up to Jo to uncover the answers and the source of a transformation that is making her powerful, strong, and dangerous.