363H: Magic Mirror Leads to Another World

I’m hoping that you can help me, I’ve been up for hours googling all the details I can remember about a book that I read and loved in 7th grade. I read this book in 2013 and I believe it was a fairly new book that the time. It may have had a second book in the series but I don’t know for sure.
I recall that the main character was a middle school or perhaps elementary school boy. I think I remember him going into a suspicious shop and noticing something odd about a mirror. Somehow he becomes in possession of this mirror. 
He discovers that the mirror is a portal that he can crawl through to get to another world. In this world I recall a forest, and maybe a fairy-like companion. In this world there is some sort of crisis taking place. I recall several instances of the boy narrowly escaping the mirror after being chased by some kind of monster. I think the boy kept the mirror in his closet. 
I can almost picture the cover of the book too. I can see lots of purple and black, and maybe some swirling style designs around the perimeter. And an illustration of the boy crouching looking into the mirror. 

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