Disappointed in her rejection by the arcane Society of Seekers, witch's foundling Sally Founder resigns herself to life as the companion of Lady Bellingham. Secretly the Host to the disembodied spirit of Samdriel, she yearns for more. Her wish is unfortunately granted after a chance encounter with evil at a London ball forces Sally and Samdriel upon a path that could lead to the discovery of their mystical bond.

Having to deal with guests at Briarstone Manor suffering from their own tragedies and a scarred young man seeking revenge, the pair have their hands full. While werewolves prowl the estate's borders, the young woman must find a way to protect her secret and her loved ones. As a bloodthirsty enemy looms in the darkness, Sally learns that secrets can be like a cage. The cost of her freedom could lead to the destruction of everything—including her heart.