Summoned by the King of Poland to help save his dying niece, Edward Kelley and his master, alchemist and scholar Dr John Dee, discover a dark secret at the heart of The Countess Bathory's malady.
But perhaps the cure will prove more terrifying than the alternative...
Jackdaw Hammond lives in the shadows, a practitioner and purveyor of occult materials. But when a young woman's body is discovered on a train covered in occult symbols, Jackdaw can't escape the attention of police consultant Felix Guichard.
Together they must solve a mystery centuries in the making, or die trying.