I notice two signed? books by Agatha Christie have been offered for sale on Ebay. The seller quotes that these books (and quite a few recently listed and sold) were part of the Shuttleworth Family collection and that these books belonged to Anthony Shuttleworth , the godson of Agatha Christie. Is there such a collection and was this Anthony the godson of Dame Agatha? I am not too sure about the signature as all the books listed and sold by this seller are in black ink and are identical in appearance. ( used with a tracing pen perhaps). Any thoughts please.