Krakow, 1585

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...

England, 2013

Jackdaw Hammond lives in the shadows, a practitioner and purveyor of occult materials. But when she learns of a young woman found dead on a train, her body covered in arcane symbols, there's no escaping the attention of police consultant Felix Guichard.

Together they must solve a mystery centuries in the making, or die trying...