Gilbert the Goblin infiltrates Santa's workshop to prove that goblins are better workers than elves in the side-splitting latest installment in The Worst! picture book series, where even the strangest of creatures can become the best of friends.Everyone knows that elves have a reputation of being the hardest workers around-especially when it comes to the holiday season-but as far as Gilbert the Goblin is concerned that's nothing but ho-ho-hogwash. A goblin's to-do list is just as long as any elf's; they just don't feel the need to sing songs about it. To prove he can outperform any reindeer-watching, wrapper-paper-wielding, toy-tinkering elf, Gilbert puts on his merriest disguise to infiltrate Santa's workshop. But can one lone goblin do the work of a whole team of elves?