Deep below the ocean, black flames are burning... Poseidon's Children have found the hidden Labyrinth. Somewhere in the tunnels of bewilderment, the Treasures of Atlas lie hidden. Within just a few hours, the Search will have succeeded - or failed. While Mielikki and her companions try to break Andromeda's Curse, their friends set out to challenge the Oldmers, and stop their ruinous war against humanity. But the Oldmers have plans of their own. The black flames are waiting. And the Labyrinth holds another secret, one that they could never have imagined: a secret that will turn their world upside down. Thus continues the epic tale of Poseidon's Children, as they face the ultimate challenge, and risk the ultimate sacrifice...