Why didn't they ask Evans? - Agatha Christie

While playing golf, Bobby Jones hit his ball hard, and it fell behind the rocky slope, and when he went to retrieve it, he was surprised to find a man who had fallen from the edge of the slope and seemed to be in his last breath.

Before the man took his last breath, he opened his eyes and said, "Why didn't they ask Evans?"

Based on these strange words, Bobby and his girlfriend Frankie set out to solve the exciting and dangerous mystery. Will they survive?