It’s May 1922 and Major Herbert Armstrong is executed for poisoning his wife - but is he innocent? The story becomes global news and inspires the most successful writer of all time, Agatha Christie.

Kitty’s body is exhumed and yields up its secrets. Detectives ponder why the Major might want his wife out of the picture. Meanwhile Agatha has marital difficulties of her own.

A mysterious box of chocolates appears at the home of the Major’s rival - is it a crucial clue or a red herring? Agatha’s Christie’s disappearance presents its own riddle.

How does Agatha Christie survive the scandal and public outrage her disappearance causes? Meanwhile, what can Kitty Armstrong’s time in an asylum tell us about her mysterious demise?

Content Warning: This episode discusses the theme of suicide in detail.

The prosecution's case against the Major hinges on the idea that Kitty Armstrong was too sick to administer the arsenic to herself. But the celebrity pathologist who gives the key evidence has secrets of his own. Agatha Christie is about to find love again.

Content Warning: This episode discusses the theme of suicide in detail.

The Major faces the perfect storm: a hostile judge and a prosecutor who plays on a moral panic about husbands murdering their wives. The jury retires to deliberate their verdict. Armstrong’s life is in their hands.

The jury delivers their verdict. Our story would end there, were it not for a lawyer who takes up the case years later. What does Miss Marple tell us about Agatha Christie?

Content Warning: This episode discusses the theme of suicide in detail.

Just in case she doesn’t survive London’s Blitz, Agatha Christie writes the final chapter of Poirot - but doesn’t publish it until years later, just months before her own death in 1976. Joe tracks down the descendants of the Major to finally put this case to rest.