Why Didn't They ask Evans?

Összefoglaló

Agatha Christie gives us a pair of her most likeable amateur sleuths in Bobby Jones, the son of a vicar in a small Welsh village, and Lady Frances Derwent, his childhood friend and now companion in crime-solving. The story is frivolous and funny thanks in large part to the wit of Lady Frances, but you will find the usual murder, villains, and high adventure in this melodramatic tale.
While golfing one afternoon, Bobby and the local doctor find a man who has apparently fallen over a cliff. The victim dies, but his last words are "Why didn't they ask Evans?" A verdict of accidental death ensues, but when Bobby is suddenly offered a high-paying job in Argentina and later someone attempts to poison his beer, he begins to suspect that someone wants him out of the way for fear of what he knows. Bobby cannot figure out what he knows, but with the help of Lady Frances he is off on a trail of clues involving a suspicious doctor, a sanitarium for the highly nervous, two beautiful ladies-in-distress, drugs, and murder.