Rachel Bross 
The Moon [EPUB ebook] 

When 7-year-old Peter loses his family, he reluctantly comes to live with the girl next door, Sarah. Years later, on her 18th birthday, Sarah finds a glowing rose in the woods.
She and Peter try to hide it on the farm; a shared secret. When Sarah’s mother finds it, she immediately sends the two of them on the run, with nothing more than instructions to run past the new moon.
While Sarah must come to grips with the loss of her parents, Peter is fighting another fight within himself: a slow change despite his efforts to ignore it.
What lies ahead for Sarah and Peter on their journey of discovery and fright, and can they come to terms and navigate the world they now live in?