Operation Trinity (39 Clues: The Cahill Files, Book 1)

Amy and Dan Cahill are called to Amsterdam to investigate the theft of a priceless Van Eyck altarpiece from a museum. The altarpiece is said to contain hidden clues to the location of the 39 Clues, a collection of powerful objects that could be used to control the world.
Amy and Dan soon discover that they are not alone in their search for the 39 Clues. A shadowy organization known as the Vespers is also seeking the Clues, and they are willing to do whatever it takes to get their hands on them.
Amy and Dan must use all of their skills and resources to stay one step ahead of the Vespers and find the clues before it’s too late. Along the way, they learn more about the Vespers and their plans for the 39 Clues. They also discover more about their own family history and the secrets that have been hidden for generations.
Operation Trinity is a thrilling adventure story that will keep readers on the edge of their seats. It is a must-read for fans of the 39 Clues series and for anyone who enjoys a good suspense novel.