Miss Mallard and her companions face many dangers on their trek to the lost city of Kimbu Tacka.  Disasters follow them from a collapsing bridge to a leaky canoe.  The greatest danger is the headless demon that protects the ancient site.  The frightened expedition members are willing to turn back without exploring Kimbu Tacka until Miss Mallard discovers that the headless demon is one of their party disguised to frighten everyone so he can steal the Kimbu Tacka treasures.

Large type and short simple sentences make this a readable choice for students transitioning to chapter books.  The start of the story is rather abrupt and hard to follow.  Bold text throughout the story is used either to identify vocabulary found in the glossary or to show emphasis.  Sometimes both purposes are found on the same page.