Knife of Rebellion: Battles of Eyenwar, Book 1

Adelina Mystica Bendithio has been overshadowed by her beautiful cousin Mirabel her whole life, until the month of her fifteenth birthday when she is told that she is one of the lucky few claimed by the powerful spirits of Eyenwar. To Adelina, this is a relief. It explains the glowing threads she can see whenever something bleeds.
When Adelina is forced to accompany her cousin Mirabel across the continent, fate brings her face to face with an evil that might be closer related to her family than she could ever have thought.