Mighty Jack and the Goblin King

From #1 New York Times–bestselling author and illustrator Ben Hatke comes Mighty Jack and the Goblin King, the thrilling conclusion to his middle-grade fantasy-adventure graphic novel series.
Like a bolt from the blue, Jack's little sister, Maddy, is gone—carried into another realm by an ogre. Determined to save her, Jack and Lilly follow through the portal—but the floating crossroads between worlds holds dangers beyond their imagination. Even the power of their magical plants may not be enough to get them home alive.
Alone and injured, Jack and Lilly face monstrous giants who grind the bones of children to feed their "beast," and a fearsome goblin king in the sewers below. Yet in the darkest moment, help comes from the most unexpected ally: the goblin king himself.
Filled with pulse-pounding adventure, imaginative worlds, and heroic magic, this finale to Mighty Jack is perfect for fans of epic fantasy, thrilling quests, and middle-grade graphic novels.