Dark Fae by Caroline Peckham and Susanne Valenti — book slip

Elise Callisto is a vampire on a mission of vengeance. Her brother has been murdered, and the only clue points to one of the four kings of Aurora Academy.

Each king, a powerful shifter or mythical creature, has a motive and a ruthless nature. As Elise infiltrates the academy, she must navigate the dangerous politics between rival gangs while keeping her true intentions hidden.

Her quest for revenge is complicated by the intense attraction she feels towards the very men she suspects.

In this dark, reverse harem romance, Elise is prepared to sacrifice everything to uncover the truth and bring her brother's killer to justice.

First in the Ruthless Boys of the Zodiac series, set in the same universe as Zodiac Academy.