The Crimson Fortress - Akshaya Raman - Bog

But finding the Ivory Key, her one hope of discovering a new source of magic, has only led to more mysteries to unravel. So when her own Council turns on her, Vira once again needs her siblings' help. As Vira and Riya head into the forest on the trail of magic, their brothers Kaleb and Ronak infiltrate the Lyrian court.