Demi has always said 'bless you' when someone sneezes. It's the polite thing to do. But does their cat count? When Missy sneezes and Demi fails to utter the appropriate response, a demon takes over their cat. The unlikely pairing undertakes adventure and hilarity, battling bigots and bigger demons, to get all the things necessary for an exorcism. Because as much as Demi doesn't want a demon in their cat, the demon wants to be there even less.