"Slade House" by David Mitchell

Ohhhh, I did not want this book to end. And yet I couldn't stop reading. And as it's a relatively small book, end it did. But what a satisfying ending!

Slade House was what The Grownup tried (and failed) to be: a magical, creepy haunted house story that is tight and polished and solid. It is unpredictable and exciting and atmospheric. Sam said it was like Harry Potter for adults. (Wait, what? Harry Potter wasn't for adults?!)

This is the story of Norah and Jonah Grayer, who are twins, but I don't want to tell you more about them because I'm sure it will be much more delicious if you taste it firsthand. They live in Slade House, the entrance of which is a small iron door into a garden. But often when people try to find that door, they can't. Each chapter of the book tells of a person who did manage to find the door . . . and then see their own portrait hanging on the wall inside the house . . .

This one's a keeper.