In the short story The Case of the City Clerk, Lucas Bonnington is a friend of Parker Pyne. In the story, he needed someone to courier the plans of an advanced gun invented by Professor Peterfield to Geneva. Parker Pyne was able to help him as he had a client, a bored city clerk who wanted some adventure. Bonnington's exact occupation or appointment is not clearly stated. He could be the head of a government department (since he talked about the need for "discipline"). Bonnington could not courier the documents himself, and most of his men were not available for various reasons. The one subordinate who was able to make the journey was Hooper but Bonnington believed that he was "crooked".

Community content is available under CC-BY-SA unless otherwise noted.