An SAS team is deployed to Gibraltar to prevent a deadly IRA reprisal following a devastating ambush. The IRA, seeking revenge for the deaths of eight terrorists in Loughgall, has targeted Gibraltar, a symbol of British imperialism. As two IRA operatives and an Irish woman infiltrate southern Spain and Gibraltar under false identities, British intelligence identifies the changing of the guard ceremony as a likely attack point. The SAS is tasked with neutralizing the threat, engaging in a high-stakes game of cat-and-mouse to stop the bombing.

The premise sets up a tense, action-packed thriller rooted in historical events. The narrative structure suggests a focus on tactical operations and the psychological pressure of counter-terrorism. The blend of historical context and fictionalized action likely appeals to readers interested in military thrillers and espionage. The description points to a fast-paced plot with high stakes, characteristic of the thriller genre.