Agatha Christie - Why Didn't They Ask Evans?

Ex-naval lieutenant Bobby Jones stumbles across a ghastly scene: a stranger has fallen from a cliff and broken his back. With his dying breath, the man utters a single cryptic question: "Why didn't they ask Evans?" Bobby Jones, ever the straight arrow, takes up the challenge.

If Bobby is a straight arrow, Lady Frankie Derwent is the bent longbow, who fires Bobby into the heart of the question: "Why didn't they ask Evans?" But before they can answer it, they must first understand its meaning.

Frankie and Bobby approach the heart of a dark conspiracy, their suspicions now centred on the menacing figure of Dr. James Nicholson. The answer to the cryptic question is finally revealed.

Risking life and limb for each other, and for the answer to the puzzle, Frankie and Bobby enter the lions' den to confront the conspiracy's true mastermind - and in so doing, finally unlock the mystery behind the cryptic question: Why Didn't They Ask Evans?