Montezuma's treasure, mysterious events, family secrets, and the importance of learning about your ancestors are themes in Montezuma Intrigue. When a leather parchment of Montezuma's map is found in great-grandfather Evans' old chest, April and the twins know this summer is going to be a memorable one. With Julia's help, she and the girls convince John to go on a treasure hunt. Is Montezuma's treasure a legend or reality? Whatever the case, John insists on keeping their little treasure hunt a secret. If certain people find out about it, the family could be in danger.