Characters: see summary for Obsidian (Lux #1)
Characters introduced in this book: Blake- Katy's new friend from school
This book starts out with Katy getting sick and being hospitalized. Daemon tells her that when Luxen heal humans it can leave a trace and that is what caused her to get sick. She and Daemon are connected now and can sense whether one or the other is in danger or present in a room.
Weird things start happening to Katy, such as items moving in her house, glass shattering, etc, and she realizes it's her that's doing everything and knows it's from Daemon's trace.
To try to ignore the attraction to Daemon, Katy goes on a date with a football player named Simon, but when he gets "handsy" she leaves. He is pissed so he starts telling everyone at school that they went all the way and he dumped her afterwards.
A new boy named Blake moves to town and he and Katy become friends. Katy agrees to go to a party with him as her date and we also find out that since Dee and Adam have been selected by the colony to marry that they have started dating and they really like each other. Katy's mom also starts dating a man named Will, and Katy tells her that although she misses her dad (he died of cancer) she is happy for her mom.
At the party, Blake tells her he can't stay long because of a family thing, so he leaves and Daemon starts talking to Katy, but Ash interrupts and tells Daemon they should "go upstairs and finish what they started". Katy is upset and goes outside for some fresh air, but Simon is there and tells her she needs to call off Daemon, because although Katy didn't know it, Daemon beat the crap out of him for what he had been saying.
When Simon comes towards her, Katy's powers flare in response and she shatters all the windows in the house near them. Daemon tells her that since Blake was drunk that he will think it was just his imagination once he sobers. They find out a few days later that Simon has disappeared.
Katy goes on a dinner date with Blake and Daemon shows up and tells her she's needed at home. Knowing it's an alien emergency she leaves and all the Luxen are gathered at Daemon and Dee's house. Matthew called the meeting because the Department of Defense has been seen hanging out around their town, so he warns Katy that she needs to be careful to act like she doesn't know about the Luxen or the DOD will kill her like they did Dawson and Bethany.
The DOD show up a few days later while Katy is with Daemon in a field, and one of the agent's tells Daemon to come with him while the woman agent tells Daemon that she will take Katy home. On the way there, the woman introduces herself as Nancy Husher and the man in the car as Brian Vaughn, a "close friend to Daemon's family". They start asking Katy questions about how close she is to Daemon and his family but Katy acts like she doesn't know anything and they drop her off at her house. Daemon shows up a while later and tells her they interrogated him too but didn't get any information.
Katy goes to lunch with Blake and plans to tell him that they need to just be friends because of the feelings she has for Daemon. When her obsidian necklace begins to warm she knows an Arum is nearby. Surprisingly, Blake attacks the Arum and kills it and Katy finds out he was mutated like her by his best friend Chris who was a Luxen.
Blake starts training Katy to control her abilities, but Daemon doesn't trust Blake and asks her to stop. He and Katy argue and she says she won't stop because she wants to be able to protect herself if more Arum show up (they can sense her now too since she has Daemon's trace/mutation thing), but Daemon says he doesn't want her to end up like Dawson and Beth.
Katy goes to pick up her mail at the post office one day after school and sees a black Expedition parked near it. She senses it's a DOD vehicle and when the door opens she sees Brian Vaughn inside along with a girl and recognizes her as Bethany from a picture she's seen.
After telling Daemon what she saw, they decide to go to Vaughn's house to see if they can find any clues, but the don't tell Dee for now so that she doesn't get her hopes up that Dawson is alive.
When they get to the house they see Vaughn go inside with Nancy and an Arum shows up and Vaughn allows the Arum inside. Daemon and Katy go to find Matthew to find out why the DOD would be working with Arum. (I'm going to put the exact conversation from the book here because it can explain it way better than I can):