I loved the idea of making history interesting for kids! When Scholastic approached me about 'The 39 Clues', I immediately started going through the 'greatest hits' from my years as a social studies teacher, and picked the historical characters and eras that most appealed to my students.

Writing 'Book 1: The Maze of Bones' didn't feel much different than writing one of my other novels, but I thought it was very innovative to offer the website and trading card components as well for those readers who wanted to go more in depth with the Cahill experience.

I've always found the second book in a series is the hardest to write.

Rick Riordan Quotes