Deep Six: The Continuing Adventures of L.J. Tibbs

From The NCIS Database, a Wikia wiki

Deep Six: The Continuing Adventures of L.J. Tibbs is a book written by Thom E. Gemcity, the pen name of Tim McGee. It is the first book in the series, Deep Six. The next is Deep Six: Rock Hollow. As stated in one episode, the book and series made him a small celebrity; some people around town knew him.