We Shall Be Monsters by Tara Sim

After her sister Lasya’s sudden death, Kajal vows to do whatever it takes to bring her back. No cost is too great, even if it means preventing Lasya’s soul from joining the cycle of reincarnation. But as Kajal prepares for the resurrection, her sister’s trapped soul warps into a bhuta—a violent, wraith-like spirit hell-bent on murdering those who wronged it in life. With each kill, the bhuta becomes stronger and fiercer, and Kajal’s chances of resurrecting Lasya with her soul intact grow slimmer. Blamed for Lasya’s rampage and condemned as a witch, Kajal is locked away with… Read more.