This is a book for 4-7th grade for sure. A young boy's parents are held hostage in a foreign country and he is sent to a obscure uncle to live with. Very nice family with a cousin who is a bit on the bossy side and also has a penchant for adventure. The boy's room is in the attic and he discovers a wall with strange doors. He also keeps getting odd postcards and letters from one of the cupboards. Each cupboard is it's own world. He also finds out some secrets about himself and one other family member. He also has to fight a witch.
I enjoyed the book and look forward to reading it's sequal. A friend's daughter read it in a day.