The King is determined to create the first map of the world and has scoured the kingdom for boys who could become mapmakers. When Quinn is chosen for the King's training school, he's amazed - but that is nothing compared to his shock when he is selected as one of the three mapmakers and finds himself on board a ship, competing for the big prize. So begins Quinn's reluctant journey deep into the unknown, on a ship captained by a slave, with a stowaway...

Picking up after Quint and Dirk's Hero Quest, the Last Kids are happily reunited--but quickly faced with a monstrous new mission. Inside an other-dimensional fortress, the evil Thrull, alongside a vile new villain, is carrying out a sinister plan. Jack, Quint, June and Dirk must make their own plans to infiltrate the stronghold before Thrull gets any closer to completing the mysterious Tower, a structure that could ultimately spell doom for this dimension....

The kids and their monster buddies are hanging out in the tree house, when Jack launches into an epic, totally-heroic, super rad story of one of his many post-apocalyptic adventures. Of course, after he's finished, everyone's eager to one-up his tale with a story of their own. Soon, Quint, Dirk, June and Skaelka, and even Globlet regale the group with sometimes outrageous, often hilarious details of their action-packed escapades during the monster-zombie...