Bookaday: Anathema by Megg jensen

Anathema - YA Fantasy

Reychel is a slave girl surrounded by magic, lies and manipulation. Her best friend disappears in the middle of the night leaving Reychel to face her fifteenth birthday, the day her master burns his brand into the back of her bald head, alone. She's sheltered from the outside world and doesn't have any hope for escape, but when people desperate for freedom ask for her help