After the tragic death of their father, Emily and Navin move with their mother to the home of her deceased great-grandfather, but the strange house proves to be dangerous. Before long, a sinister creature lures the kids' mom through a door in the basement. Em and Navin, desperate not to lose her, follow her into an underground world inhabited by demons, robots, and talking animals. Eventually, they enlist the help of a small mechanical rabbit named...

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...

At an ordinary friend's gathering, I came into contact with Thai Buddhist cards. Since then, this mysterious thing that has nothing to do with Buddhism has completely changed my life. There seems to be an invisible hand that has involved me again and again in thrilling and strange puzzles.

Emily and her friends think they'll find the help they need in Cielis, but something isn't right. Streets that were once busy are deserted, and the townspeople who are left live in fear. Emily is soon escorted to the Academy where she's expected to compete for a spot on the Guardian Council, a group of the the most powerful Stonekeepers. But as the number of competitors gets smaller and smaller, a terrible secret is slowly uncovered--a secret that,...

"Despite fame and countless admirers, actress Marcail Beauchamp has never forgotten William Hurst, the audacious seafarer she once loved...and lost. Now, forced by a mysterious blackmailer who threatens her family, she must steal an ancient onyx box from the one man she's vowed never to see again. To save his brother from a ruthless abductor, William must deliver the artifact as ransom. He's stunned when Marcail, more lovely than ever, suddenly appears...

Emily survived the chaos of the Guardian Academy, but Max Griffin has stolen the Mother Stone. With it, the Elf King forges new amulets that will give him the power to invade and destroy the nation of Windsor. Emily and her friends lead the soldiers of the Cielis Guard in a fight to stop him, but Max stands in their way. And when she seeks information from the Voice of her Amulet, she discovers that the Voice is much more sinister than she ever could...

After the tragic death of their father, Emily and Navin move with their mother to the home of her deceased great-grandfather, but the strange house proves to be dangerous. Before long, a sinister creature lures the kids' mom through a door in the basement. Em and Navin, desperate not to lose her, follow her into an underground world inhabited by strange creatures, robots, and talking animals.Eventually, they enlist the help of a small mechanical rabbit...

Emily, Navin, and their crew of resistance fighters charter an airship and set off in search of the lost city of Cielis, which is believed to be located on an island high above the clouds. The mysterious Leon Redbeard is their guide, and there's a surprising new addition to the crew: the Elf King's son, Trellis. But is he ally or enemy? And will Emily ever be able to trust the voice of the Amulet?

Navin and his classmates journey to Lucien, a city ravaged by war and plagued by mysterious creatures, where they search for a beacon essential to their fight against the Elf King. Meanwhile, Emily heads back into the Void with Max, one of the Elf King's loyal followers, where she learns his darkest secrets. The stakes, for both Emily and Navin, are higher than ever.

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.