An explosion rocks Yellowstone. A strange disease begins to spread. A supervolcano threatens to erupt.

And none of it was an accident.

A reclusive Yellowstone park ranger is forced into action, teaming up with a beautiful woman from the CDC.

Harvey Bennett isn't a trained killer, but he'll fight for what's right.

And he'll do anything to take down the terrorists behind the attack.

From Yellowstone across the American landscape, Harvey and Juliette must do what it takes to survive, before it's too late.

Grab the first book in the fast-paced action-adventure thriller series today that's been described as "National Treasure meets Indiana Jones" and "the next James Rollins."

"Looking for action adventure books for men? You've come to the right place..."

From USA Today Bestselling Author Nick Thacker, The Enigma Strain is a fast-paced action-adventure thriller with elements of conspiracy, medical, and virus-based post-apocalyptic themes. If you like James Rollins, Clive Cussler, and Preston & Child, you will love the Harvey Bennett Thrillers series.