The Lost Twin Scarlet And Ivy Series, Book 1.

This is the story of how I became my sister... A spine-tingling mystery set in a creepily atmospheric boarding school. Ivy must uncover the secrets behind her twin sister Scarlet's disappearance before it's too late. When troublesome Scarlet mysteriously disappears from Rookwood School, terrifying Miss Fox invites her quiet twin sister Ivy to 'take her place'. Ivy reluctantly agrees in the hopes of finding out what happened to her missing sister....