When Miranda Sun returns to Marin on the eve of her eighteenth birthday, this time of her own free will, she quickly learns that her worst fears have been realised. The glittering underwater city is not as she had left it, nor too is Marko, the young king who has dominated her thoughts and heart for the last twelve months since leaving Marin.

Miranda, however, has not made the journey to Marin alone, and now must contend with not only Marko's evil brother Damir but more surprisingly her sister Lauren who has an agenda of her own. Marko's power begins to wane and with cracks beginning to show in the domed Utopian city, and veiled danger lurking everywhere, she quickly learns that in this dazzling city full of beautiful people she can trust no-one but herself.

If Miranda wants to survive, she must decide between the hardened sensibilities in her head and the hungers of her heart. Will her decision cause more heartache or can she help to save Marko's throne?