I read a book and I need help remembering the title:?

The book started out in an antique store and the store owner was the narrator. He told the story about a woman who had an autistic child during the late 50's or 60's. She ran a boarding house and took in a dying boarder. Turns out that the dying boarder was a rich man, he helped her with her autistic son, they fell in love and got married and lo and behold the antique store owner was their child.

What's the name of the book or who is the arthur? Anybody??? p.s. I think the book may have come out in 2009 or early 2010.