The thrilling tale of a secret European sect and the musical mastermind at its center, from a critically acclaimed novelist at the top of her form.

The bodies are discovered on New Year's Day, sixteen dead in the freshly fallen snow. The adults lie stiff in a semicircle; the children, in pajamas and overcoats, are curled at their feet.

When he hears the news, Commissaire André Schweigen knows who to call: Dominique Carpentier, the Judge, also known as the 'sect hunter.' Carpentier sweeps into the investigation in thick glasses and red gloves, and together the Commissaire and the Judge begin searching for clues in a nearby chalet. Among the decorations and unwrapped presents of a seemingly ordinary holiday, they find a leather-bound book, filled with mysterious code, containing maps of the stars. The book of the Faith leads them to the Composer, Friedrich Grosz, who is connected in some way to every one of the dead. Following his trail, Carpentier, Schweigen, and the Judge's assistant, Gaëlle, are drawn into a world of complex family ties, seductive music, and ancient cosmic beliefs.

Hurtling breathlessly through the vineyards of Southern France to the gabled houses of Lübeck, Germany, through cathedrals, opera houses, museums, and the cobbled streets of an Alpine village, this ferocious new novel is a metaphysical mystery of astonishing verve and power.