From the bottom of the oceans of the world a hidden threat stalks mankind—probing, testing our weapons and defenses, biding time to strike. In the summer of 2039, this aquatic foe unleashes surprise attacks against coastal cities around the globe. Mankind faces a sophisticated new enemy, arrived from the depths of space and lurking in the dark blackness of the seas.

A secret buried in the Antarctic. A puzzle unsolved for thousands of years. And a Brooklyn-born master gunnery sergeant who's royally pissed that he has to babysit the researchers sent to figure it all out. But when Patrick "Wic" Finnegan finally sees what the team has uncovered, he can't believe his eyes, nor is he prepared for the violence to come. Soon, the portal opens and unleashes a storm of unbridled fury upon humanity.

After more than 20 years in special operations, USMC Gunnery Sergeant Wolf Mathison wasn’t looking forward to retirement when—implanted with an experimental artificial intelligence—he deployed on his last mission with a platoon of Marine Raiders being sent to the Jovian moon Europa. The USS Jefferson was destroyed en route, though, and only Mathison and three other marines survived. Trapped in stasis, they were hurled into the outer reaches of the solar system, where they wouldn’t be found for hundreds of years.

Technical Specialist Kerry Sevvers is the Division's deadliest weapon. His neural implant and team of battle AIs make him an unstoppable force in the war against alien raiders that plague the Three Colonies. Years ago, the raiders stole his mother, fueling a thirst for vengeance that led him to create Six, an unsanctioned AI with limitless potential, far beyond Division control. When a secret rescue mission uncovers a chilling truth—an unknown alien vessel lurking far beyond the colonial frontier—Sev and his team are thrust into a war for their very survival.

Idealistic Navy Lieutenant Jacob Grimm just wanted to honor his mother’s sacrifice in the last great war. When he’s forced to return fire and destroy a squadron of ships to save his own, he thinks he’s the hero...until they discover the ships are full of children. Disgraced and denied promotion, Jacob’s career is over. That is until the head of ONI needs a disposable officer to command a battered destroyer on the rim.

Mars and the Moon have been colonized, piracy runs rampant in the asteroid belts, and a thriving society grows in the depths of space. Humanity prepares to embark upon its greatest journey - the colonization of Alpha Centauri. Then, everything changes. A deep space reconnaissance probe discovers a new Earth-like planet 12 light-years from Earth’s sun. The probe also finds something unusual, something unnerving. A new mission is created, a space fleet is formed, and humanity embarks on unravelling the greatest mystery of all - the origins of life itself.

Five years ago, aliens destroyed a carrier and its airwing at Jupiter without warning. Since then, the Earth’s nations have learned to work together, and they want to know more about the aliens who appeared, attacked, and vanished without a trace. The Americans have provided a new carrier. Chinese technology has made going after the invaders possible. And the Russians have developed a new control system that will give the craft never-before-seen capabilities. Mankind’s next war is upon us, and Uplink Squadron is the tip of the spear.

As a sci-fi author with a hit TV show, I have a few ideas about what alien invaders are supposed to look like. In my stories, they’re technologically advanced monsters, with tentacles, and no faces. Turns out I was right about the technology. And about how angry they’d be. But the way they look…that’s more terrifying than even I could have imagined. They look exactly like us. Because they are us.

The Martian meets Gravity when Army Pilot Vaughn Singleton, Earth’s last man, rushes to Area 51 in search of a spaceplane after he discovers the last woman is stranded on the International Space Station and barely alive - thus beginning a race against time. The event that wiped life from the planet started at the supercollider. It created a rift in space-time. The astronaut stranded aboard the space station, Commander Angela Brown, is a theoretical physicist who used to work at the collider.

After two brutal, bloody struggles for their very existence against implacable alien foes, humanity is victorious, but not at peace. As distrust and accusations consume the political discourse between the two major factions, the Eastern Star Alliance military has already begun executing small raiding missions into United Terran Federation space. The Federation fleet, still reeling from the last war, is in no shape to try and protect its own borders.

Get ready to experience two more origin stories in the Backyard Starship universe.

In a lab deep in the heart of China, a brilliant engineer had a breakthrough. It was the most powerful AI ever created. Ma Young believed the Jade Dragon could combat the world’s most dire challenges. There was just one problem...the president of China had other ideas. Was this their chance to conquer?

In the wilds of a jungle planet, the Legion fights in brutal combat as Republic marines fly their SLICS from one tragedy to the next. H292, a repurposed warbot, shows the heart of a hero as he wades into the battle not to destroy - but to save.

The human soldiers stranded on the planet Paradise have been recruited into an alien legion to do the dirty jobs that the high-tech species won't do. Their first mission is to kick the enemy off a backwater planet no one cares about. It's a simple assignment, except everyone has a hidden agenda, and the planet could become a deathtrap.

A company of Army Rangers is sent on an interstellar colony ship to secure a foothold on a dangerous, alien planet through violence of action. Leaving behind a warring Earth flung headfirst into a conflict of mutual assured destruction, the Rangers and the accompanying crew of first colonists are guided on a 40-year journey by an unprecedented artificial intelligence. But when they emerge from the frigid embrace of cryosleep, they awake to a nightmare, finding themselves greeted by the same ruthless enemy that brought about the ruin of Earth.

The galaxy was once terrorized by the Sturm, a group of “species purists” intent on destroying any human with genetic or cybernetic enhancements. Fashioning themselves as the one true “Human Republic,” the Sturm cut a bloody swath across the stars, killing billions before finally being defeated and driven into the far reaches of Dark Space. Centuries of peace bred complacency. Everyone believed the Sturm had died out in the Dark. They were wrong.

Logan Conner is the son of a king, the heir to the largest of the five star-dominions, and the best mech pilot in the galaxy. His people are plagued by pirates and raiders, surrounded by enemies, and not even his father can fight them all. Logan gives up his position, his rank, even his name, and becomes Jonathan Slaughter, leader of a rough-and-ready band of mercenary mech-jocks bent on taking the battle to the enemy on their own terms.

The plot by the Galactic Union’s Mercenary Guild against the Four Horsemen has culminated in an invasion of Earth. Faced with an overwhelming force, the human mercs had no choice. They’ve fled, leaving Sansar Enkh to go to the Mercenary Guild headquarters on Capital Planet to stand trial for humanity. On the run, Jim Cartwright and Nigel Shirazi have travelled to the Winged Hussars’ secret base of New Warsaw, in an effort to convince Alexis Cromwell to join the fight, while the other mercenaries who escaped the fall of Earth have gone to the perceived safe haven of Karma.

Tired of sitting out the war on Psydon in a mobile office lab, Legion Lieutenant Washam agrees to undertake a covert and unsanctioned mission with a band of Republic Recon Marines. Inserted deep behind enemy lines, the strike force uncovers a surprise key to ending a bitter war. Now they must navigate a hostile jungle teeming with murderous alien rebels, pushing themselves to the limits of their abilities, to get this vital intel to Legion Command - if they can survive that long.

Once, Jackson Rook was a war hero. Raised from boyhood to pilot an exosuit mech, he’d fought gallantly for the rebellion against the Collectivists. But that was a long time ago, on a world very far away. Now, Jackson Rook is a criminal, a smuggler on board the Multipurpose Supply Vehicle Tar Heel. His latest mission: steal a top-of-the-line mech called the Citadel and deliver it to the far-flung planet Swindle, a world so hostile even the air will kill you. The client: a man known only as the Warlord.

The first book in an action–packed new SF adventure series. Vulcan is a factory planet, centuries old, Company run, ugly as sin, and unfeeling as death. Vulcan breeds just two types of native: complacent or tough. Sten is tough. When his family is killed in a mysterious accident, Sten rebels, harassing the Company from the metal world’s endless maze-like warrens. He could end up just another burnt–out Delinquent. But people like Sten never give up.

The Peacemaker-enforced ceasefire brought an end to the hostilities, but not a resolution, and now it’s up to the Four Horsemen to forge a lasting peace. Alexis Cromwell, despite her pregnancy, heads off to Capital with Nigel Shirazi to obtain justice from the enigmatic Mercenary Guild Council, but when they arrive, they’re quickly embroiled in galactic politics, and find out the situation is far, far worse than they could possibly have imagined.

Cloaked by the mists of dawn, Task Force 61 - carrying tanks, aircraft, and over 5000 Marines - steams toward Syria with deadly intent. Their mission: rescue 100 hostages from a terrorist stronghold - alive. With realism seldom seen in military fiction, The Med is a magnificent and timely epic that brings the human drama of armed conflict compellingly to life.

With Earth in the path of the rapacious Posleen, the Galactic Federation offers help to the backward humans - for a price. You can protect yourself from your enemies, but God save you from your allies!

The New York Times best-selling master of alternate history delivers the captivating first novel in his new World War II series. Harry Turtledove imagines how the war in Europe would have ended had British prime minister Chamberlain refused to allow Hitler's annexation of the Sudetenland.

Ragnar Beck only wanted one thing out of a life - the chance to soldier. In a war for the survival of the last continent untouched by the invader, Beck finally gets his shot to prove he’s a combat warrior. As the battle unfolds and the only choice is to fight to the bitter end, he performs like the soldier he was raised to be, leaving no enemy standing on the last battleground he’ll ever see. Or is it?

Former SEAL Michael Harmon, Team Name ''Ghost'', retired for service injuries, is not enjoying college life. But things are about to change, if not for the better. When he sees a kidnapping, a series of, at the time logical, decisions leave him shot to ribbons and battling a battalion of Syrian commandos with only the help of three naked co-eds who answer to the names ''Bambi,'' ''Thumper'' and ''Cotton Tail.'

He was in a gang but was trying to change his future, when a board member of the elite advanced academy NEXUS made a snap decision and offered him a chance. Then fate, or an unbalanced genius, offered him another. The Nexus Academy is for the elite trainees from Earth, and now trials from our alien allies, as they teach the future generation how to fight, lead, hack, spy, and many other talents and tactics. Hired by companies, governments, and NGOs, these graduates work to pay off the massive debt their training at the academy accumulates.

At a time when Humans were just starting to venture forth into the Galactic Union as mercenaries, Martin Quincy survived long enough to do something no one else had - he retired. There was only one problem: He got bored. After battling aliens for many years - killing aliens and getting paid - retirement didn’t suit him, and he decided to strap on the combat armor and go back to the stars. Along with his old friend Kal, Martin joined Cartwright’s Cavaliers, humanity’s best merc company. Life was exciting! But he got bored. Again.

The Hundred Worlds have withstood invasion by the relentless Hok for decades. The human worlds are strong, but the Hok have the resources of a thousand planets behind them, and their fleets attack in endless waves. The long war has transformed the Hundred Worlds into heavily fortified star systems. Their economies are geared for military output, and they raise specialized soldiers to save our species. Assault Captain Derek Straker is one such man among many.