The Fallen Star: Billy Smith and the Goblins, cartea 2

Billy Smith has been crowned king of a besieged goblin city, thanks to a resourceful (if somewhat cowardly) goblin named Hop. Now all Billy has to do is save the goblins from a genocidal human army. No pressure.

The day after Billy's coronation, the human Army of Light, from the distant kingdom of Hanor, lays siege to the goblins' underground capital, Kiranok. The Hanorians, led by the blood-thirsty High Lord Jiyal, plan to kill every last goblin in Kiranok. Desperate, Billy tries to come up with a plan to save his new subjects. While scouting the enemy army, Kurt and Lexi spot a falling star as it comes crashing to the ground far in the distance. In the goblins' world, meteorites can be used as sources of magic to power tremendous spells. If they can retrieve the falling star before the humans, they can use it to save their city. But if the humans get it first, the goblins are doomed.