On the last morning of fifth grade, Sam Culver loses his favorite word. Then, right after that, two more words disappear ... No matter how much trouble Sam gets in, he knows that he can always rely on his magic word, "sorry," to get him out of a pinch. Teasing his little sister too much? "Sorry!" Hurt someone's feelings in class? "Sorry!" But when a group of goblins comes and steals his "sorry," he's in more trouble than ever. To get his word back, Sam chases the goblins through a portal. On the other side, he meets Tolver, a young goblin who's always dreamed of adventure. Tolver wants to cast off the goblins' old ways and explore the world, but his grandma warns him of the untrustworthy goblin prospectors who rule the skies with their fancy technology. When Sam and Tolver are captured by prospectors, they'll have to work together to find the depository of stolen words and outsmart their captors—and do it all before Sam's parents ground him forever!