When a wealthy cult initiate collapses and dies after consuming ritual wine, Inspector Roderick Alleyn must navigate the insular and deceptive world of the House of the Sacred Flame to identify a killer. Alleyn arrives at the scene to find a group of fervent believers whose public piety masks private greed and hidden agendas. He must methodically dismantle the group's elaborate facade, relying on his keen observation and logical deduction to isolate the source of the prussic acid. The narrative follows a traditional investigative framework, focusing on the interplay between the detective's cool professionalism and the erratic behavior of the cult members.

Ngaio Marsh is frequently cited alongside Agatha Christie and Dorothy L. Sayers as a pillar of the Golden Age of detective fiction. Her work is noted for its sophisticated prose, theatrical flair, and the meticulous construction of her puzzles. Readers often appreciate the intellectual rigor of Inspector Alleyn's investigations and the atmospheric depth of the settings she creates. The enduring appeal of this novel lies in its ability to balance a complex, logical mystery with a sharp, observant look at the eccentricities of human behavior.