Mary Russell and Sherlock Holmes have stirred the wrath of a murderous secret organization bent on infiltrating the government, in this tenth novel in their series by Edgar, Nero, Macavity, and CWA Dagger Award winner Laurie King, following closely on the heels of The Language of Bees. Russell and Holmes must separate—he to find a specialist to save his grown son Damian Adler, shot by a religious fanatic with agents across Europe, and she to safeguard Damian's little daughter Estelle, who may be the next victim.