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 was later noted as containing plot elements which were similar to the circumstances of the September 11, 2001, terrorist attacks and the hijacking of United Airlines Flight 93.

Thomas Leo Clancy Jr. was an American novelist. He is best known for his technically detailed espionage and military-science storylines set during and after the Cold War. Seventeen of his novels have been bestsellers and more than 100 million copies of his books have been sold. His name was also used on screenplays written by ghostwriters, nonfiction books on military subjects occasionally with co-authors, and video games. He was a part-owner of his hometown Major League Baseball team, the Baltimore Orioles, and vice-chairman of their community activities and public affairs committees.