The Shape Stealer. Urban Fantasy

Garet James is the watchtower - the last in a long line of powerful women sworn to protect our world from evil... She once defeated the malign sorcerer Dr Dee, but her pursuit of the man she loves - the centuries-old vampire Will Hughes - has unleashed another ages-old entity into our time - a being that threatens everything and everyone. His name is Marduk and he is the descendant of a demonic Babylonian deity.
Now abroad in Paris, he has sought out the villainous John Dee and they have hatched a plan together that will create chaos and ensure ruin. And it will fall to Garet to confront this new threat. Around her she gathers a band of modern-day knights - a brotherhood dedicated to preserving the sanctity of the time-line. But there are others out there who would see Garet fail and who will stop at nothing to bring an end to everything she - and we - hold dear .