The highly-anticipated eighth book in the #1New York Times,Wall Street Journal, andUSA Todaybestselling series, with over 10 million copies in print!

Picking up afterQuint and Dirk’s Hero Quest, the Last Kids are happily reunitedbut 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.