When a sudden coup d'etat destabilizes a Caribbean nation, a detached physician finds his carefully maintained neutrality shattered by the encroaching political violence. Doctor Ernesto Castillo, known as 'Doctor Frigo' for his icy professional demeanor, attempts to navigate the treacherous landscape of exile and international intrigue. As regional powers maneuver for control, Castillo is forced to confront the reality that his medical expertise makes him a target for competing factions. The narrative unfolds through a measured, observant lens, tracking his struggle to preserve his life and autonomy amidst shifting loyalties and lethal geopolitical stakes.

Eric Ambler is widely recognized as a master of the political thriller, and this work is frequently cited for its intellectual rigor and cynical view of international power struggles. The novel is noted for its departure from traditional spy tropes, favoring a character-driven study of a man forced into a world he prefers to ignore. Readers often highlight the protagonist's internal conflict as the primary engine of the story, noting how his clinical detachment serves as both a shield and a liability. The prose is consistently praised for its precision and the author's ability to maintain suspense without relying on sensationalism.