Savage Fae by Caroline Peckham and Susanne Valenti

There’s more to my brother’s murder than I realised… Shadows in the halls, mysteries lurking around every corner. Whoever killed him is covering their tracks well. And now I’m walking a dangerous line between getting close to the four kings for information and wanting to crawl deeper under their skin for my own desires. I can’t trust anyone. I can’t let my guard down. And I must keep the urges of my body separate from my heart. But I’m starting to break all of my own rules. I just hope I’m not falling for my brother’s killer.