When seven members of their family were kidnapped, thirteen-year-old Dan Cahill and his older sister, Amy, got ready for the fight of their lives. But their enemy, a terrifying group known as the Vespers, remained frustratingly elusive. They stay in the shadows, picking off Cahills one by one.
39 clues (Scholastic Audiobooks). Cahills vs. Vespers ; bk. 5.
The 39 clues. Cahills vs. Vespers
The 39 clues. Cahills vs. Vespers ; bk. 5.
Brothers and sisters -- Juvenile fiction.
Code and cipher stories.