Set in Mexico on the Day of the Dead in 1938, the novel follows the last day in the life of Geoffrey Firmin, a British consul with a severe alcohol addiction. Through his interactions with his estranged wife and half-brother, the book explores themes of despair, betrayal, and the destructive power of addiction, against the backdrop of political and social unrest. The impending eruption of the nearby volcano serves as a metaphor for Firmin's deteriorating mental state and the looming world war.