Protector is the first book in the Full Blood Series by Dutch Author Serena Nova.
Protector tells the story of Isadora, the last full blooded witch. And this is a problem. Being the last full blood could put her life in danger, so as a child her grandmother forced her to hide her gifts before sending her to an elite school to train witches and Protectors. Isadora’s grandmother knew that full blooded witches that didn’t know how to defend themselves were already dead. Isadora was able to conceal herself for 12 years before her best friend, the closet family she had, was threatened. So powers don’t stay hidden for long and unfortunately for Isa the wrong people saw what she could do. Now her only way on is to meet the 4 kings whether she wants to or not.