A Sound Of Thunder

When a time-travel agency starts selling prehistoric safaris to wealthy hunters, there are three simple rules: don't change anything in the past; don't leave anything behind; and most important, don't bring anything back. But when one of the hunters breaks the rules, evolution starts to unravel. As the present day starts to fall apart, scientists Dr Travis Ryder and Dr Sonia Rand must find a way to go back and correct whatever catastrophic error was made, to save themselves and the human race from certain extinction.