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 frustr...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.