This book is not for everyone. The prose style is dense, there are far too many characters, and the novel requires at least a passing knowledge of opera. However, the cattyness of the observations, the rhythmns of the sentences and their unexpected twists and turns, make for delightful reading.
A sample of the prose is the best introduction.
"While His Scarlet Eminence and Msgr. Finneagle sat playing their esoteric version of Monopoly, the custom-crafted board for which could be seen to represent the several circles of Dante's Inferno, Purgatorio, and Paradiso, as well as the ground plan for the entire Vatican, both the above-ground palaces' apartments, closets, and chapels, and those labyrinthine catacomb reaches where Darkest Rumor is said on good authority to repose in thrilling reptile fashion. His Scarlet Eminence snickered in pixyish glee, having caught his opponent in the square of the seventh circle of hell (with four hotels). Monsignor trembled (livid), bankrupt of plenary indulgence."
Should you find this amusing and well-written, you'll love this book. If not, you'd best pass.