Thorns and Crowns (Court of Sin, #0)

Not every princess are destined for a happily ever after. Some must suffer, rise and rule.
Before she became the cold, calculating unseelie queen, Shea was a young woman, awoken in the middle of the night by guards, daggers in hands. Betrayed by her own father, she’s forced to make her own way, and carve her destiny.

Note that this is a prequel.