Vicious Fae by Caroline Peckham & Susanne Valenti (Ruthless Boys of the Zodiac Book 3)

The King will fall.

While I continue my hunt for the Fae who killed my brother, I have to try to keep my heart away from the vicious boys who could be responsible for his death.

But as my investigation leads me down a dangerous road and answers seem closer than ever before, I'm whisked away to the elite school, Zodiac Academy, with the four Kings and my heart becomes more vulnerable than ever.