Mark Harmon and NCIS Agent Leon Carroll Jr. Announce Nazi-Fighting Mob Story Ghosts of Sicily — See the Cover! (Exclusive)

Harmon, 74, and retired NCIS special agent Leon Carroll Jr. are releasing their upcoming book, Ghosts of Sicily: The True Story of the Naval Intelligence Agents Who Courted the Mob to Fight Nazis in America and the Battlefields of Italy, on April 14 — and PEOPLE has an exclusive first look at the cover.

Harper Select, an imprint of HarperCollins, will publish the forthcoming book, which will transport readers back to 1942 New York to learn how the “Office of Naval Intelligence (ONI) turned to an unlikely ally — the mob — to protect America’s waterfronts,” per the synopsis.”The book chronicles the ONI’s controversial alliance with Charles ‘Lucky’ Luciano, the daring missions of agents like Tony Marsloe and the pivotal role this operation played in both the war effort and the evolution of international crime,” the synopsis continues.PEOPLE can exclusively reveal the cover for Mark Harmon and Leon Carroll Jr.’s third book together, Ghosts of SicilyThe book chronicles the true story about how the Office of Naval Intelligence worked with the mob “to protect America’s waterfronts” during World War II”All records were burned after WWII. Why?” Harmon says in an exclusive statement. “Read Ghosts of Sicily and find out.”