Mia’s ordinary life is disrupted for good in the most horrifying way possible when she is possessed by a hungry and powerful demon - and saved only by the arrival of relatives from Italy, the country her grandfather fled many decades ago. Now her cousins, the charming and gorgeous Emilio, and stern, elderly Giuliano, say the only way to keep Mia safe is for her to come back with them to Milan - to live, to learn Italian, to fall in and out of love, and to master the family trade: fighting all demons with the ancient lore of bell, book, and candle.
Mia has settled into her life with the Della Torres - Milan's premier demon-catching family, accompanying them to exorcisms and even learning some way to be useful in the family trade. Then Bernardo comes into her life, handsome, well-mannered, someone who makes her forget her impossible crush on Emilio, her cousin. But always lurking in the background is the demon who possessed Mia once before, and who has not given up on possessing her again - this time for good.