'' Debt of Honor '' is a techno-thriller novel , written by Tom Clancy and released on August 17 , 1994 . A direct sequel to '' The Sum of All Fears '' ( 1991 ) , Jack Ryan becomes the National Security Advisor when a secret cabal of Japanese industrialists seize control of their country ’s government and wage war on the United States . The book debuted at number one on '' The New York Times '' bestseller list . The novel later became well-known for foreshadowing the September 11 attacks
September 11 attacks
September 11 attacks
Debt of Honor