Emily, her brother, and their crew of robots continue to travel in the underground world to the city of Kanalis to find an antidote for her mother.

As they seek the town's doctor, elves begin to tighten their grip on Kanalis which puts the city under depression.

At the city, they meet the humanoid fox Leon Redbeard who teaches Emily about the danger of her amulet.

Meanwhile, while climbing the mountain, Leon shows Emily how to focus her amulet's power with a walking stick.

At the same time, the sinister voice of her amulet is growing stronger and almost makes her injure Leon and leave Miskit.

While the elves travel through Demon Mountain, Luger injures Trellis, believing that he would stand get in their way and seeing him as useless.

Themes of The Stonekeeper's Curse includes resisting a greedy temptation, as shown when the Amulet almost gets full control over Emily.

The book was named The Stonekeeper's Curse because of the scene when Leon was explaining to Emily about what would happen if the Voice took full control.