Arwen Valondale sails toward the mysterious Kingdom of Citrine after the Battle of Siren's Bay, still shaken by the loss of her mother and the impact of her new powers. She channels all her pain and anger toward the man who betrayed her: King Kane Ravenwood. But Kane's presence is inevitable as he leads Arwen and her friends on a quest to retrieve the Sword of the Sun, a legendary weapon with the power to kill the tyrannical King Fae Lázaro. As Arwen faces unimaginable dangers, her determination is tested in ways she never anticipated.