The 39 clues. Unstoppable
Author
2) Breakaway
Author
Series
Language
English
Description
Dan Cahill and his sister Amy travel from the hottest to the coldest regions of the world in order to stop someone from using their own power against them.
3) Countdown
Author
Series
Language
English
Description
With Amy and Dan still in pursuit of Pierce, Amy does something unthinkable that sends shock waves through her family.
4) Flashpoint
Author
Series
Language
English
Description
Amy and Dan Cahill have their final confrontation with twisted billionaire J. Rutherford Pierce, a man whose power has no limits and is one step away from being elected president.