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4-639 Clues: Unstoppable series.
Cahill siblings Amy and Dan continue their dangerous mission to stop evil media mogul Pierce from world domination in the spinoff series' second and third books. Relationships are tested and loyalties questioned when Amy takes matters into her own hands in Breakaway and makes a rash decision in Countdown. Plot development feels a little sluggish, but action-heavy moments raise the stakes. Review covers these 39 Clues: Unstoppable titles: Breakaway and Countdown.