The thrilling conclusion to The Extinction Files is finally here!

A code hidden in the human genome...will reveal the ultimate secret of human existence.

And could hold humanity's only hope of survival.

In 2003, the first human genome was sequenced. But the secrets it held were never revealed.

The truth was discovered 30 years ago, almost by accident. Dr. Paul Kraus had spent his entire career searching for what he called humanity's lost tribes - human ancestors who had gone extinct. When Kraus compared the DNA samples of the lost tribes with our own, he found a pattern of changes: a code. At the time, the technology didn't exist to unravel what it meant. To protect the secret, Kraus hid his work and disappeared. Now the technology exists to finally understand the mysterious code buried in the human genome, but finding the pieces of Kraus' research is more dangerous than anyone imagined.

Dr. Peyton Shaw and her mother have obtained part of Kraus' research - and a cryptic message that could lead to the remaining pieces. They believe his work is the key to stopping a global conspiracy - and an event that will change humanity forever.

The ultimate secret, buried in the human genome, will change our very understanding of what it means to be human. For Peyton, finding it may come at an incredible price. She must weigh the lives of strangers against those she loves: Desmond Hughes and her mother. With time running out, Peyton makes a fateful choice - one that can never be undone.