When Rosie is finally picked for show-and-tell at school, she worries she has nothing special to share — until she and her canine companion, Rolland, discover a strange map. They follow it from its starting point in her adventurer grandfather’s study through to a mysterious jungle kingdom, where a secret pyramid houses a monkey king. In his hands is the perfect item to bring to show-and-tell, if Rosie can defend it from bully Freddy Jones.