The title of Chesteron’s 1910 collection of essays was inspired by a title given to him two years earlier by The Times newspaper, which had asked a number of authors to write on the topic: “What’s wrong with the world?”. Chesterton’s answer at that time was the shortest of those submitted – he simply wrote: “Dear Sirs, I am. Sincerely yours, G.K. Chesterton”. In this collection he gives a fuller treatment of the question, with his characteristic conservative wit.

(Summary by Wikipedia and Carl Manchester)