Retired NCIS Special Agent Leon Carroll sits at a table in his home and shows off the two books with co-wrote with actor Mark Harmon.
250305-N-CK721-0041.JPG Photo By: Bill Krumpelman

Dec 5, 2025
QUANTICO, Va. - Leon Carroll, Jr. poses with copies of books he wrote with "NCIS" actor Mark Harmon. "Ghosts of Honolulu" is a New York Times Bestseller.


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