Berkshire, England 1926.

A Morris Cowley was being driven erratically through the country lanes. Anger was brewing up inside Agatha, preventing her from driving with due care and attension. Thirty-six-year-old Agatha wiped the tears away from her eyes as she drove on through the dark winter night. 

It was 3rd December 1926 and Archie Christie had just walked out on Agatha, his wife, after a blazing row to spend that weekend with his mistress in Surrey. This was no surprise to Agatha, she knew her husband had been seeing another woman behind her back. She just hoped that it would not come to him actually walking out, wanting a divorce. She was prepared to play second fiddle in her marriage to Nancy Neele if it meant keeping Archie.

Agatha left their house not long after her husband at around 9:45pm. Throwing some clothes in the back of her car, she too...