Liv and Aisling are honeymooning in the beautiful Emerald Isle when bored with the stock tour of her family's ancestral castle, Aisling goes exploring. She stumbles upon an old library, and before Liv can stop her, she's muttering aloud in a language neither one of them speaks, unleashing an ancient family curse.

Now with the help of some friends, the couple has to race against an unspeakable evil and discover how to defeat it before it destroys the world.