39 Clues: Cahills vs. Vespers

Join thirteen-year-old Dan Cahill and his sister Amy in a thrilling continuation of their journey in the bestselling series as they face a new threat from a mysterious group called the Vespers. With distress calls pouring in and their friends kidnapped, the siblings must decipher a strange ransom request within days to save them from a dark fate. As the stakes rise and the clock ticks, Amy and Dan realize that they must outsmart the Vespers to prevent a catastrophe that could hold the world hostage. This action-packed adventure spans six explosive books and offers additional interactive content to immerse readers in the experience.