In 2001, ten-year-old Alex, an American kid still adjusting to life in Paris, boards a Metro train, only to watch a thunderstorm freeze time and a cloaked man appear.
The stranger calls himself Gustave Eiffel and delivers a prophecy: two children must protect what must endure.
Teaming up with Elise, a restless Parisian twelve-year-old, Alex follows the clues to a time machine hidden inside the Eiffel Tower. It hurls them back to 1889, where Eiffel is racing to complete his iconic tower for the Paris World's Fair.
But not everyone wants the Tower to stand.
To save history, Alex and Elise must face sabotage, explosions, and their own fears.
Because if the Tower falls, so does the future.
Charlie Clark