What were the main themes of the book? Adventure and coming of age. Justin and Adam follow their Aunt Isabel on a trip to Europe. When one of them discovers what he thinks is a meaningless piece of paper, their world becomes topsy turvy and they soon find themselves deep in a mystery they know nothing about.
Are the characters well-developed? Every single one. From the evil Dr.Khalid to the boys, their grandmother and aunt, readers are able to discover each character at length and you do not have unanswered questions about their backgrounds or behaviours.
Did you like the writing style? Very much. If you have grown up with Enid Blyton, the Hardy Boys or Nancy Drew, you will definitely like this book. Fiona Ingram's overall tone is original and works well with the story.
Disclosure - As a Quality Reads Book Club member, I received a free copy of this book from the author via Orangeberry Book Tours in exchange for my honest review.