A review by thompson3
Countdown by Natalie Standiford

4.0

Action packed Cahill adventures continue in this latest installment in The 39 Clues mysteries. Tweens, ages 10-13, will be drawn in from the exciting paparazzi/Pierce thug chase to the near fatal plane crash over volcanoes. For 39 Clues fans and readers just beginning the series, Unstoppable is a wonderful addition to the series.