The Crystal Entanglement. Blank Magic, #2

Can a pile of crystals be evil? They can, especially if they are possessed by the soul of a malevolent witch bent on destruction and revenge on the living. When they become the property of a mad aristocrat the capital becomes the domain of a monster who consumes the souls of both men and wizards; but wizards are tastier. The Blank Magic books are set in an alternate reality where magic works. Set in WW2; the Nazi high command has set up a division of the SS to wage clandestine magical warfare against the allies.
Britain is forced to respond with its own magical forces; helped along by a small cast of characters who populate the fringes where the normal and magical worlds meet. The book is approximately 192, 000 words