Wodehouse wrote in a letter to William Townend dated 6 March 1932,
(...) It's not all jam writing in the first person. The reader can know nothing except what Bertie tells him, and Bertie can know only a limited amount himself.
This letter is quoted in P.G. Wodehouse in His Own Words, edited by Barry Day (Abrams, 2012).
One of Wodehouse's early novels was ...