Twins (Fearless #19)
The worst part? The enemy is one of her two known relatives: her uncle, or his identical twin brother: her father. And whichever one of them "Loki" turns out to be, he's coming for Gaia next....
This is one of the better books. It's great and involving. It hooks the reader from start to finish. It's very enjoyable and I liked it a lot. It's great and full of twists. It's good, but Gone is better.