In a fateful act of kindness on a shadowy night, Grace Holt helps a mysterious stranger only to be swept away to a magical realm of hideous monsters and handsome kings. With King Cassian Scalyvar by her side, Grace travels the treacherous lands rife with arcane secrets, as encroaching shadowy forces and chaotic sorcery relentlessly pursue them in the hopes of stopping them in their mission to destroy an ancient evil, once and for all.