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Thirteen-year-old Dan Cahill and his older sister, Amy, thought the search for the thirty-nine clues leading to the source of their family's power was over, but when Cahills are kidnapped by the Vespers, Amy and Dan find themselves with only a few day to fulfill a bizarre ransom request before their friends start dying.

Thirteen-year-old Dan Cahill and his older sister Amy race against time to find an ancient map that has not been seen for half a century and use it to redeem their family members who have been kidnapped by a sinister organization called the Vespers.

Siblings Amy and Dan must find another way to outwit the Vespers when they target and kidnap Dan's only friend, eleven-year-old Atticus.

Thirteen-year-old Dan Cahill and his sister, Amy, figure out Vesper One's endgame and realize they must stop the organization from using their ransoms to harm millions of people.

Siblings Amy and Dan must find another way to outwit the Vespers when they target and kidnap Dan's only friend, eleven-year-old Atticus.