中文简介：

在这本DK图书公司为7至9岁儿童出版的新教育小说系列中，学习所有关于骑士和城堡的知识。迎接秘密探险家——一群来自世界各地的脑力劳动者，他们将带领小读者进行一系列充满事实的虚构冒险！他们各有专长，从外太空到恐龙，这些年轻的环球旅行者将告诉孩子们，学习可以很有趣，鼓励他们在自己喜欢的领域成为专家。在这本有趣、充满事实的儿童读物中，工程探险家琪琪和历史专家古斯塔沃陷入了一个诡异的时间旅行之谜，一个幽灵般的人物出现在一个中世纪的城堡里，吓坏了众人！

英文简介：

Learn all about knights and castles in this spooky history-themed instalment of DK Books' new educational fiction series for children aged 7 to 9 years old.Meet the Secret Explorers - a band of brainiac kids from all around the world, here to take young readers on a series of fact-filled fictional adventures! Each with their own specialty, from outer space to dinosaurs, these young globetrotters will teach kids that learning can be fun, encouraging them to become experts in something they love. In this fun, fact-filled children's book, Kiki the engineering explorer and Gustavo the history expert get caught up in a spooky time travel mystery when a ghostly figure shows up at a medieval castle and terrifies the crowds!