The island of Polis, which lies under the sun of the volcanic planet Monos, is home to the families of the Descendants. Their ancestral powers maintain the Balance and keep Chaos at bay during the 49 years of the Round.

But in the fiftieth year, the shadow of the planet Mavros spreads and with it the threat of war. The birth of Aïone, the extraordinary blue-skinned child, appears to be the cause of a plethora of upheavals. The island’s volcano awakens at the same time, and her brothers Gê and Aether develop extraordinary abilities.

Earthquakes, dreadful storms, drought, lava flows - a cycle of calamities of supernatural proportions begins. All wonder if the little girl, who is growing at a phenomenal rate, is an element of Balance or Chaos? Will Aïone, Gê and Aether, with their enviable gifts, be torn from their village? And who will have the power to calm the Maelstrom in the heart of the volcano?