The Last Kids on Earth and the Forbidden Fortress
“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.” — Provided by publisher. Commercial audiobook. For grades 3-6.