Postern of Fate
Agatha Christie
 Now in their seventies (though the authoress never states their age clearly), Tommy and Tuppence move to a quiet English village, looking forward to a peaceful retirement. But, as they soon discover, their rambling old house holds secrets. Who is Mary Jordan? And why has someone left a code message in an old book about her 'unnatural' death? Once more, ingenuity and insight are called for as they are drawn into old mysteries and new dangers.