Dark Whispers

When Cara Diana Hunter discovers that an ancient story holds the secret to ending the bitter feud between unicorns and the monstrous delvers, she sets out on a dangerous quest through the shadowy underground world and into the court of the centaur king. At the same time, her father embarks on a separate journey from India to the notorious Rainbow Prison, determined to free Cara's mother from captivity. As both quests unfold, trust is scarce and enemies lurk at every turn, forcing the pair to race against dark forces that threaten to tear apart the fragile balance between their worlds.