From the liner notes

Will Ferrell stars as an obsessive/compulsive IRS auditor who begins to hear a voice that turns out to be an author who is writing a novel in which Ferrell is the ill-fated protagonist. The auditor heeds the narrator's advice and turns his life around. Emma Thompson plays the author suffering from writer's block, and Queen Latifah will play a book-company employee whose job is to unblock writers. Maggie Gyllenhaal plays Farrell's unlikely love interest, a baker with anarchist leanings.