Francesca Annis as Frankie Derwent

In the novel Why Didn't They Ask Evans?, Lady Frances "Frankie" Derwent is a plucky young woman. She is a friend of Bobby Jones. They solve a mystery together. She is the daughter of Lord Marchington, and has two brothers.

Lady Frances is also related to the Draycotts, acquaintances of Sylvia Bassington-ffrench.

Frankie Derwent stages a fake car crash near Merroway Court so that she could investigate the family living there.

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