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Mark Harmon revealed the differences between his NCIS book and the show Harmon would eventually end up writing the book Ghosts of Honolulu with Leon Carroll Jr., a former real-life NCIS agent.
After Mark Harmon left NCIS at the beginning of Season 19, the actor finally returned to the franchise for the prequel series NCIS: Origins (which is airing now on the 2024 TV schedule). Harmon ...