The Stonekeeper's Curse (Amulet, Book Two)

Mysterious world full of allies-and old enemies! 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 felled their mother. That cure lies in the eggs of a giant serpent atop Demon's Head Mountain, but the kids' arch-enemy, Trellis, is headed for the peak too. A battle that will engulf all of Kanalis is looming. It's up to Em to triumph over evil while controlling the amulet's power ... without losing herself!