Emily and Navin's mother is still in a coma from the arachnopod's poison, and there's only one place to find help: Kanalis, the bustling, beautiful city of waterfalls. But when Em, her brother, and Miskit and the rest of the robotic crew aboard the walking house reach the city, they quickly realize that seeking help is looking for trouble, dangerous trouble.The Elf King's son, Trellis, is still after them, but this time he's accompanied by a mysterious...

As the Elf King makes new amulets that will give him power to destroy Windsor once and for all, Emily and her friends desperately make preparations to defend Cielis in what will inevitably be a brutal war, hoping that it will be enough to defeat the Elf King.

"Emily, Trellis, and Vigo visit Algos Island, where they can access and enter lost memories. They're hoping to uncover the events of Trellis's mysterious childhood -- knowledge they can use against the Elf King. What they discover is a dark secret that changes everything. Meanwhile, the Voice of Emily's Amulet is getting stronger, and threatens to overtake her completely" --

"When Emily loses control of her Amulet, she is imprisoned in the Void, where she must escape the influence of the Voice, while her brother, Navin, travels to a space station where the Resistance is preparing to battle the approaching Shadow forces"--OCLC.

-- New York TimesAfter her confrontation with Ikol, Emily finally understands the stone's power and what she must do to defend Alledia from the shadows. As she travels to Typhon to help her mom and Navin, Prince Trellis returns to the Kingdom of the Elves to save his countrymen -- and confront the fraud who has seized power in the absence of a king. The threat of darkness follows all Stonekeepers closely, and it will take the strength of both new...

Emily and her friends go to Cielis for help, but something is very wrong, and as the number of Stonekeepers gets smaller and smaller, an awful secret is slowly uncovered that means the certain destruction of everything Emily fights for.

Emily and her brother, Navin, head for Kanalis in order to find the antidote for the poison that has sickened their mother.

Emily, Navin and their crew of resistance fighters charter an airship and set off in search of the lost city of Cielis. there they hope to find held from the Guardian Council's powerful Stonekeepers. It's a mission that Alledia's survival depends on, and time is running out -- Emily's got to find Cielis before the Elf King finds her.

"Emily, Trellis, and Vigo visit Algos Island, where they can access and enter lost memories. They're hoping to uncover the events of Trellis's mysterious childhood-knowledge they can use against the Elf King. What they discover is a dark secret that changes everything. Meanwhile, the Voice of Emily's Amulet is getting stronger, and threatens to overtake her completely"--Provided by publisher.