I highly recommend Marcy Kennedy's Busy Writer's Guides, especially Point of View and Deep Point of View. Point of View (POV) is one of the hardest concepts for aspiring writers (and even some old hats) to grasp. And even when writers understand, they still tend to head hop without realizing it. But "Hey," you say, "Nora Roberts head hops." Yep, some famous writers head hop all through their books, and some genres are more forgiving of this practice. But read a book where the author uses a deep point of view, and you will see why editors, agents, and publishes advise against head hopping. Marcy Kennedy is clear, concise, and easy to understand. I recommend this book to all my writer friends and clients.