Reckless By. Cornelia Funke

This book is about dark fairy tales. This boy Jacob went into his fathers study, and in his fathers study was a mirror. And this mirror had a secret portal that someone or thing could go in and out of it. One day Jacob found a letter on his fathers desk , and it sad how to open the mirrors portal. " The mirror will only open for the man who can not see himself."  after he opened the mirror his whole life changed.