Fleeing Briarstone Manor, Sally and her Nephilim spirit, Samdriel, arrive in London on a quest to find the father she never knew. Yet, the young woman becomes frustrated to the point of despair under the coal-blackened skies of the hostile city. Standing on the banks of the River Thames, she is tempted to surrender all hope when help arrives in the form of Adrien Wordsmith and his loyal dog. Together, they save a mysterious woman from the frigid waters of the river and the three find safety and companionship at Adrien's Emporium and home.

But their sanctuary soon comes under siege as old enemies, criminal gangs and the mystical Society of Seekers draw them into a growing conflict. For, in the shadows of old London, a deadly supernatural predator hunts other creatures of magic like Sally and her new friends. As the stakes rise and time runs out to find her father, she and Samdriel must take more and more desperate chances. The search for answers and her elusive father may cost the witch's foundling everything—including her life.