Anne Perry 
Christmas Gathering (Christmas Novella 17) [EPUB ebook] 

A festive house party takes a sinister turn…Victor Narraway and his wife, Lady Vespasia, are invited to spend Christmas at Cavendish Hall with a gathering of old acquaintances, but it is not the quiet, rather stiff house party they had expected. While there, Victor must undertake his final mission for Special Branch, reminiscent of another one in the past, at which he had tragically failed.When disaster strikes and one of the guests is left for dead, Victor fears that history is repeating itself. But which of them is intent on murder? And can Victor accept that he is not to blame…?A Christmas Gathering is the gripping new festive mystery from the pen of Anne Perry, the master of Victorian crime.