Petropol Book Store Ripped off an elderly lady Brookline Massachusetts

Petropol Book store owner took down payment for the rare book from my 78 years old Mother on 02/25/13 promising her the delivery of the book within a month.  As of 07/29/13 there is no book, and no money back.  My Mother contacted the store several times, and the answer was -- the owner Ilya Livanov is not here, and nobody can give her a status of the transaction.  I live in WA state, so I can't physically go to the store and demand the money. I called the store, and got the owner on the phone.  The answer was -- I will give money back.  Still, no money, and no book.  I found the book on another website, and purchased it, but the deposit from Petropol book store still has not been returned to my Mother.