The Stonekeeper's Curse (Amulet #2)

In this thrilling sequel to "The Stonekeeper," Emily and her brother, Navin, head for Kanalis, a beautiful and mysterious city of waterfalls, where they hope to find the antidote for the poison that has sickened their mother. It's up to Em to triumph over evil while controlling the amulet's power . . . without losing herself.