The culprit is revealed to be Landon , the guy from McGee’s local coffee shop. He became obsessed with the book and believed he was "protecting" the McGee character.
As the body count rises following the plot of his book, the team must figure out how the manuscript was leaked. They eventually discover the killer didn't hack a computer or steal a file; they were from the trash to read his work. Key Highlights Watch NCIS S04E (20)
The episode pokes fun at McGee’s writing, especially when the team discovers he gave his Gibbs-inspired character a love interest who is an Army Lieutenant Colonel—strikingly similar to Gibbs' real-life romantic interest at the time, Lt. Col. Hollis Mann. Where to Watch The culprit is revealed to be Landon ,