Melusine is a female demon. No, she doesn't have horns and carry a pitchfork. She is an otherworldly being who lives on a different plane of existence. As leader of a group of demons who have come to present-day Earth (in human form) to investigate the 21st century, she realizes that one member of the group is gone.
Wye-Wye is the youngest member of the group, and insatiably curious, so it is very easy for him to follow his own path to satisfy that curiosity. After much diligent searching, and several broadcast summons (respond immediately or else), the group concludes that Wye-Wye is not just hiding or has lost track of time, he is Seriously Missing.
Melusine takes a big chance, and calls in Paige Ballantyne, human investigative reporter, to help in the search. She tells him all about their origin, and why they're on Earth. As a professional cynic, it takes him a while to accept it. Their search takes them to several different cities. In Toronto, Melusine meets Cyprian, an old friend and fellow demon. He has spent too many years in human form, so he is now "stuck"; he can't change back to demon form. Meantime, the relationship between Melusine and Ballantyne turns serious.
The search moves to Austin, texas, and has to do with an academic conference on the "Left behind" series of novels. It's a place where the residents take their religion (specifically, the End Times) very seriously. Stand-up comedy jokes about it are not acceptable. The group of demons gets involved with the leader of a small local militia group. He has a very well-stocked underground bunker, and is not going to just wait for the End Times to come.
This is a gem of a book. It is an easy to read love story, and a search-for-missing-person story, with just enough weird in it. This is recommended for everyone, even those who think that they won't like fantasy or paranormal books.