Why Didn't They Ask Evans?: Agatha Christie

While playing an erratic round of golf, Bobby Jones slices his ball over the edge of a cliff. His ball is lost, but on the rocks below he finds the crumpled body of a dying man. The man opens his eyes and, with his last breath, says, `Why didn`t they ask Evans?`
Haunted by those words, Bobby and his vivacious companion, Frankie, set out to solve a mystery that will plunge them into mortal danger...