Mark Harmon Teams Up With Real-Life NCIS Agent For New Book 'Ghosts of Honolulu'

Mark Harmon reflects on almost 20 years of starring on "NCIS," and shares how he's taken his relationship with real-life NCIS agent — and the show's technical advisor — Leon Carroll, Jr. from the set to co-author their new book "Ghosts of Honolulu." Mark also dishes on his college jazz professor who made a lasting impact on his life.