In Why Didn't They Ask Evans?, Bobby Jones finds a dying man on a golf course in the Welsh town of Marchbolt. The man's last words are "Why didn't they ask Evans?" . Bobby and his friend Lady Frances Derwent try to solve the mystery of the man's identity.

The man, Alan Carstairs, was a Canadian explorer, naturalist, and big-game hunter. He was falsely identified as Alex Pritchard by Amelia Cayman, a woman claiming to be his sister.