Beth is an archeologist who specialized in Irish history and mythology. During the excavation of a mound in Ireland, she came into contact with Conn, the fae who was once imprison in the mound. Conn is attracted by her and tries to seduce her with his magic, but Beth manages to resist him by using iron, the faes' weakness and to escape. However, Beth ex-husband who was doing the excavation with her is a dishonest man and he stoles parts of the treasure present in the mound, among which a sword that can summon the fae court back into the human world. Fortunately for the humans, the druids who are the ones who have imprisoned the fae have also put a spell on Conn who obliges him to prevent anyone from using the sword. Thus, he chases Beth back to the US and forces her to help him to retrieve the sword before it is too late. 
 I really love the fae mythology present in this book; we really get a sense of how alien the faes are and of how different their morals are and I also found the characters fascinating. Before the roman invasion of England, druids rebelled against the faes despite the fact that they are the ones who taught them magic. They managed to imprison them all, but they put some of them in mounds that they could easily access in order to be able to interrogate them and to make them serve them. When the druids were killed by the Romans and their knowledge lost however, those faes were free to roam free among the humans. The faes reacted in different ways; Conn, the hero, only gets out of his mound for short amount of time during which he uses magic to seduce women before abandoning them to madness. Other faes like Miach have chosen to live in the human world and have formed clan composed of their numerous progenies. And others like the prince only see humans as toys to be broken for their own amusement and want to free the rest of the fae court from the prison the druids have thrown them in. All of them don't hesitate to use their powers for their own benefit with little to no regards for the consequences. The magic system was also interesting: the faes have a glamour that can seduce any human and make them mindless puppets, but magic is mostly used by the faes and the druids via geis, magic tattoos that force their bearer to obey their commands. Those can be very diverse, like Conn's which makes him protect a sword, or like those the faes put on women to makes them desire them and only them and who makes them go mad when they are abandoned and can't have sex anymore with their masters. The rest of the world building and the use of Irish mythology are also very well done. 
 As for the relationship between Beth and Conn, I found that it evolves in a very believable way without Conn suddenly behaving out of character because of love. He slowly gets attached to Beth and only starts to change the way he act so as not to upset her. We also learn about his past and the fact that he is more predisposed to like human than other faes, which makes his attachment more believable. 
 The other characters, Beth's best friend Helen and her ex-husband were also well drawn and I found them sufficiently lovable and repulsive respectively. They helped Beth get a fully fledge history with lots of depth and we can really get behind her motivations and cheer for her. 
 Another point that I really like is the way consent or the lack of is addressed in this book. The faes used glamour and magic to make women desire them and at no moment was it presented as something other than rape. We see it both with Beth and Helen, when they say no they meant it and Conn comes to understand it and respect it and he even gives Beth ways to resist his glamour. When Beth and Conn finally come together, there is no doubt that it is of her own free will. Considering how this sort of thing is usually addressed (or not addressed) in paranormal romance, I was very pleasantly surprised. I also appreciate that the author made no attempt to excuse Conn's behaviour with women along the centuries. He may love Beth now but that doesn't change in any way what he has done before. 
 I am really curious to learn more about the world and to see what the prince will be up to next and I can't wait for the next book to come out.