E. R. Punshon, The Bittermeads Mystery — Chapter 22 (1922)
“ He began to laugh again and Dunn laughed, too, for while he was not sure what it was that amused Deede Dawson, there were certain aspects of all this that bore for him a very curious and ironic humour.“All right,” he said. “You bring me face to face with Rupert Dunsmore and you won't have to grumble about the result, for I swear only one of us will go away alive. But how are you going to do it?”“I've my plan, and it's simple enough,” answered Deede Dawson. “Though I can tell you it took some working out. But the simplest problem is always the best, whether in life or in chess.” ”
