Who is the protagonist in The Cat Who Played Post Office by Lilian Jackson Braun?

Jim Qwilleran is the protagonist and central character in the novel, The Cat Who Played Post Office. Jim is a single, tight fisted, writer, whose one luxury is his beloved Siamese cats. When Jim visits Mooseville on vacation, he comes to learn that he has inherited a large estate. He moves to Pickax in accordance with the will naming him heir.