For readers outside the United States and (I think) Canada, Head of Zeus has been offering special Christmas deals on its books and today, The Ninth Day of HoZmas, the book is One for Sorrow

Byzantium AD 535: Ambition, intrigue, treachery, murder... Just another day in the Imperial Court.

"Darned close to being the perfect historical mystery", Booklist

To discover for £1, click here.