Amulet, Book 2: The Stonekeeper’s Curse by Kazu Kibuishi

Summary from Goodreads: “In this thrilling sequel to AMULET #1: 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 felled their mother. That cure lies in the eggs of a giant serpent atop Demon’s Head Mountain, but the kids’ archenemy, 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!”