Welcome to Ancient Greece in modern times!! This trilogy is interesting in the way it presents the Greek gods/goddesses and how they actually behave.
So we start off with Kate Winters and her very sick mother. They are moving to her mother's home of Eden, Michigan so she can spend her final days there. Kate is finishing high school and has been preparing for this day for a long time, but her mother is all she has in the world. She meets some interesting people at school, like the friendly James, the popular/bitchy Ava, the rude playboy/Ava's boyfriend Dylan, and a secretary named Irene who knows all about Kate's mom. Ava invites Kate to a party at a mysterious manor that is surrounded by greenery and fences. Kate is reluctant to go, but follows Ava. After a terrible accident, Kate's life changes forever. She meets Hades, the god of the Underworld, who now goes by Henry. He heals Ava and asks Kate to participate in the goddess test. Kate must stay with him for half of the year and pass a series of test administered by the Council (aka the other gods/goddesses) and if she does not pass she will either die or be sent away with no memory of what has happened for the last 6 months. Every woman that has participated in these tests so far has died, and Henry is ready to give up. If this happens, then Henry will fade or cease to exist.
Kate refuses to join this until Henry offers to help her mother. He tells her that he cannot heal her, but he can keep her alive. Kate readily agrees, against James many warnings. Kate moves into Eden manor where she is taken care of by the sweet Calliope and the brash Ella. They dress her, test her food for her, and make sure she has everything she needs. Ava follows her to Eden manor as a ghost as she died when Kate refused Henry the 1st time. Kate also runs into Irene from the school who is her mythology or history teacher. Kate tries to adjust to her new life and get to know Henry, but it's hard when he keeps up a constant wall. How do you get to know someone who won't let you in? Kate eventually makes her way into his heart and learns that he is still hurt and in love with his former wife Persephone. She was the daughter of Demeter and she had an arranged marriage with Hades. He was madly in love with her and she did not return his affections. Eventually she fell in love with a human named Adonis and Hades/Henry granted her mortality so that she could grow old and die with the man she truly loved. Obviously this destroyed Henry's heart and this creates a big obstacle for Kate. She meets with her mother every night in her dreams and discusses it with her. Kate falls for Henry, and it's hard to tell, but he does fall for her to. It's a sweet read. Until Kate is murdered. Yup. You read that part right. Things go horribly wrong with a major plot twist and that is all I'm going to tell you.
However, this is a trilogy so I'm sure you can guess that either Kate doesn't really die, she's brought back to life, or it was some crazy dream or something. Otherwise, this would have been a 1 book and done kind of thing.
The following books are good, but I do think the first was the best. The 2nd book had a part or 2 that infuriated me to no end, and I'm still angry when I think about it, so that obviously skews my view of it. Read it and you'll understand. The 3rd book brings a very interesting view of the Titan Cronus and is a heartbreaking and interesting read.
I definitely recommend these books (especially if you like Greek mythology).