When the National Security Agency’s invincible code-breaking machine encounters a mysterious code it cannot break, the agency calls its head cryptographer, Susan Fletcher, a brilliant, beautiful mathematician. What she uncovers sends shock waves through the corridors of power. The NSA is being held hostage…not by guns or bombs but by a code so complex that if released would cripple U.S. intelligence. Caught in an accelerating tempest of secrecy and lies, Fletcher battles to save the agency she believes in.

Particle physicist Jon Grady is ecstatic when his team achieves what they've been working toward for years: A device that can reflect gravity. Their research will revolutionize the field of physics - the crowning achievement of a career. Grady expects widespread acclaim for his entire team. The Nobel Prize. Instead, his lab is locked down by a shadowy organization whose mission is to prevent at all costs the social upheaval sudden technological advances bring.

At 12, Gideon Crew witnessed his father, a world-class mathematician, accused of treason and gunned down. At 24, summoned to his dying mother's bedside, Gideon learned the truth: His father was framed and deliberately slaughtered. With her last breath, she begged her son to avenge him. Now, with a new purpose in his life, Gideon crafts a one-time mission of vengeance, aimed at the perpetrator of his father's destruction. His plan is meticulous, spectacular, and successful.But from the shadows, someone is watching. A very powerful someone, who is impressed by Gideon's special skills.

Earth's century of peace as a colony of an alien race has been shattered. As the alien-run government navigates peace talks with the human terrorist group Sapience, Donovan tries to put his life back together and return to his duty as a member of the security forces. But a new order comes from the alien home planet: withdraw. Earth has proven too costly and unstable to maintain as a colony, so the aliens, along with a small selection of humans, begin to make plans to leave. Suddenly Earth becomes vulnerable to a takeover from other alien races....

The witnesses are legion, scattered across the world and dotted through history, people who looked up and saw something impossible lighting up the night sky. What those objects were, where they came from, and who - or what - might be inside them is the subject of fierce debate and equally fierce mockery, so that most who glimpsed them came to wish they hadn't. Most, but not everyone.

At 33, Ryan Kealey has achieved more in his military and CIA career than most men can dream of in a lifetime. He's also seen the worst life has to offer and is lucky to have survived it. But being left alone with his demons is no longer an option. The CIA needs him badly, because the enemy they're facing is former U.S. soldier Jason March. Ryan knows all about March - he trained him.

Astronomer and TV science guy Gevin Rees just landed the interview of a lifetime with the world's most famous physicist. Remarkable, because the eccentric genius is notoriously reclusive, and he's already dead. What happens next forces Rees to run for his life from not one but two deadly assassins and global powers desperate to bury what he's just uncovered. Mind-blowing technology and solid evidence that would rewrite religious history and challenge the faith of billions.

Robert Tracy is spirited away from his own execution. A top-secret government project makes him an offer he can't refuse: work for us or disappear permanently. With no choice, he embarks on a mission to undo a terrorist attack that has already occurred, by being sent back in time 36 hours. But all is not as it seems. Soon, a conspiracy at the highest level of government to seize total power over the country threatens the second chance at life he has been given.

The fate of humanity lies on the shoulders of Burt Radcliffe, the new head of NASA's Near Earth Object program. He's been rushing the completion of DefenseNet, a ring of satellites that are both part of an early-warning system, as well as the means to eliminate incoming threats. Yet Burt knows that despite the world's best efforts, nothing can be done about the alert he's just received. Coming out of deep space is a danger that's been approaching since the dawn of time. A black hole. An unstoppable threat that promises death for all in its wake.

Simon Kovalic, top intelligence operative for the Commonwealth of Independent Systems, is on the front line of the burgeoning Cold War with the aggressive Illyrican Empire. He barely escapes his latest mission with a broken arm and vital intel that points to the empire cozying up to the Bayern Corporation: a planet-sized bank. There’s no time to waste, but with Kovalic out of action, his undercover team is handed over to his ex-wife, Lt. Commander Natalie Taylor.

The first three books in the riveting new thriller series from Wall Street Journal and USA Today best-selling author L.T. Ryan. The Blake Brier books are gripping thrillers loaded with twists, suspense, and nonstop action.

Circles is the most popular social network in the world: vast, ubiquitous, and constantly evolving. Days before expanding into China, Circles suffers a devastating cyberattack - and a key executive is brutally murdered. As he fights to save the company he helped build, top engineer Sergio Mansour uncovers evidence of a massive conspiracy that turns the power of Circles against its users. But as Sergio investigates, someone is watching his every move - someone ruthless enough to brand him a criminal and set a vicious hit man on his trail.

On a cold night in Australia, two construction workers driving along a deserted mountain road are gunned down inside their vehicle. The killings are fast. Efficient. An assassination carried out with expert precision. The only witness to the crime is a man resting by the side of the road. Recently retired, he'd flown halfway across the world to escape his demons. Ex-US black ops operative Jason King.

Thirty years ago, in a facility buried beneath a vast Wyoming emptiness, an experiment gone awry accidentally opened a door. It is the world’s best-kept secret—and its most terrifying. Trying to regain his life in the Alaskan wilds, ex-con/ex-cop Travis Chase stumbles upon an impossible scene: a crashed 747 passenger jet filled with the murdered dead, including the wife of the President of the United States.

In the mid-23rd century, Darwin, Australia, stands as the last human city on Earth. The world has succumbed to an alien plague, with most of the population transformed into mindless, savage creatures. The planet’s refugees flock to Darwin, where a space elevator—created by the architects of this apocalypse, the Builders—emits a plague-suppressing aura.