Olivia Williams

Agatha Christie

Anna Massey

Old Agatha Christie

Raymond Coulthard

Archie Christie

Stephen Boxer

Psychatrist

Anthony O'Donnell

Hercule Poirot

Anthony O'Donnell

Kenward

Mark Gatiss

Kenyon

Richard Leaf

Gunman

Bonnie Wright

Young Agatha Christie

Celia Montague

Agatha Christie's Mother

James Tucker

Reggie

Vicki Pepperdine

Carlo Fisher

Bertie Carvel

Max Mallowan

Edmund Kingsley

Soldier

Gregory Finnegan

Band Member

Toby Stephens

Doctor Edward Armstrong

Agatha Christie

Self (archive footage)