A modern dark urban fantasy, telling of two powerful families who uphold a secret duty to protect humanity from a threat it doesn't know exists. Though sharing a common enemy, the two families form a long-standing rivalry due to their methods and ultimate goals. Forces are coalescing in a prominent Central European city- criminal sex-trafficking, a serial murderer with a savage bent, and other, less tangible influences. Within a prestigious, private university, Lilja, a young librarian charged with protecting a very special book, finds herself suddenly ensconced in this dark, strange world....

The tale continues in Sword of the Butterfly, book two of the series, as Lilja and Skothiam continue to fight demons within and without. The infernal forces make a grand play, hoping to stab the world in its very heart. Casualties mount as further tensions rise in the City, threatening the vigilante with a loss of freedom and life. Children become victims of a madman's design while the hunt is on for a powerful creature wreaking havoc across parts of the U.S. Lilja begins to question herself and her place in Skothiam's life even as the very treasure they must protect comes under danger.