Butterfly effect: The scientific theory that a single occurence, no matter how small, can change the course of the universe forever.
A father and son diving off the coast of Hawaii, with the sharks closing in. A scientist in a forest under attack from a savage bear. A young girl who has been kidnapped by drug dealers in Rio. The teenagers surfing on top of a speeding bullet train.
For them, and many others, things will never be the same again.
Some will live. Many will die. All are connected.
The action is non-stop in this tense and compelling adventure.