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

This standalone novel from the world of The 39 Clues explores the secrets surrounding the Cahill family's centuries-old power and their connection to a legendary masterpiece, Jan van Eyck's altarpiece at Ghent. Spanning different eras, including the 1600s and WWII, the story follows efforts to protect the artwork from theft and destruction, culminating in a thrilling and revealing adventure involving key Cahill characters.