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https://bookclubs.scholastic.ca/en/-last-kids-on-earth-and-the-forbidden-fortress-/92893407-cec-ca.htmlDescription
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.