Into the Gauntlet

Amy and Dan Cahill have finally uncovered the Madrigals’ plan: to use the 39 Clues to open a portal to another world, a world where they will rule supreme. Amy and Dan must use all of their skills and resources to stop the Madrigals before it’s too late.
Along the way, they learn more about the true power of the 39 Clues and the secrets of their own family. They also meet a number of interesting characters, including a former Madrigal agent and a group of international spies.
Into the Gauntlet is a thrilling and suspenseful conclusion to the 39 Clues series. It is full of action, adventure, and twists and turns. The book is also a great introduction to the world of espionage and global intrigue.