Summary

In Part One, “Here Lies Sister Mary,” years ago, Nan O’Dea almost “killed a woman” (3). It felt as sweet as justice.

Although Agatha Christie was fascinated by murder, she never “wanted to kill anyone” (3). Nan had gotten to know her “in the years after the Great War” (3). When Agatha later discovered Nan’s true crime, Nan admitted she “had regrets" (4).

In “The Disappearance, One Day Prior, Thursday, December 2, 1926,” although Nan wanted to marry Archie, she advised him not to leave Agatha so soon after her mother’s death. In his office, Archie touched Nan. Agatha arrived shortly thereafter. Because Archie was busy, Agatha took Nan to lunch. Afterwards, Agatha confronted Nan, insisting she did not love Archie.

Because Archie was covering Nan’s expenses, Nan skipped work to buy a book for Archie and Agatha’s daughter, Teddy. She hoped...