A.G. Riddle

In Marbella, Spain, Dr. Kate Warner awakens to a horrifying reality: the human race stands on the brink of extinction. A pandemic unlike any before it has swept the globe. Nearly a billion people are dead—and those the Atlantis Plague doesn't kill, it transforms at the genetic level.

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....

A mysterious signal from deep space may hold humanity’s last chance of survival. And could reveal the ultimate truth of human origins. The race to unravel the secrets of the Atlantis world has begun.

In Antarctica, a research expedition discovers an ancient structure buried deep in the ice. In Indonesia, a genetics researcher identifies a breakthrough treatment for autism. But these two incredible discoveries aren't what they seem....

At the end of the world, a groundbreaking scientific experiment will change everything. Dr. Laura Reynolds had it all. A job she loved. The respect of her peers. Student debt she was slowly chipping away at. And one day, it all went away....

At CERN, a scientist has just made an incredible discovery—a breakthrough that may answer the deepest questions about human existence. But what he's found is far more dangerous than he ever imagined....

From the worldwide bestselling author of The Extinction Trials, Departure, and The Atlantis Gene comes a new kind of sci-fi thriller: a time-travel murder mystery with a twist you'll never see coming....

After a mysterious global event known only as “The Change”, six strangers wake up in an underground research facility where they learn that they’re part of the Extinction Trials - a scientific experiment to restart the human race. But the Extinction Trials harbors a very big secret....

En route to London from New York, Flight 305 suddenly loses power and crash-lands in the English countryside, plunging a group of strangers into a mysterious adventure....

They decimated Earth during the Long Winter. Now the Grid has returned, and they won't stop until the human race is extinct. On a ruined world, humanity's last survivors fight against impossible odds....

On Eos, the last survivors of the Long Winter face their greatest challenge yet - and race to unravel the deepest secrets of the grid. The last survivors of the human race escaped a ruined Earth. Their new homeworld - Eos - seemed perfect at first. Warm. Hospitable. Safe from the grid....

The ice is coming. It was the last thing we expected, but a new ice age has dawned. Billions have fled the glaciers. War is coming. In orbit, a group of scientists are running experiments. Close to the edge of the sun, they catch a fleeting glimpse of something that shouldn’t be there....

In Marbella, Spain, Dr. Kate Warner awakens to a horrifying reality: the human race stands on the brink of extinction....

The greatest mystery of all time...the history of human origins...will be revealed....

In Atlanta, Dr. Peyton Shaw is awakened by the phone call she has dreaded for years. As the CDC's leading epidemiologist, she's among the first responders to outbreaks....