Earth has been conquered by robots from another galaxy and the human survivors must stay in their homes, or risk incineration.
England, December 1926. Although her personal life is in tatters, the famous writer Agatha Christie decides to leave everything behind to help unravel an unsolved murder committed on a train six years ago, unable to imagine the disproportionate consequences that such a selfless act will cause.
A WWII veteran escapes his care home in Northern Ireland and embarks on an arduous but inspirational journey to France to attend the 75th anniversary of the D-Day landings, finding the courage to face the ghosts of his past.
