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In the extraordinary Worldwar tetralogy, set against the backdrop of World War II, Harry Turtledove, whom Publishers Weekly has called the "Hugo-winning master of alternate SF," wove an explosive saga of world powers locked in conflict against an enemy from the stars.

It is the year 12,020 GE and Emperor Cleon I sits uneasily on the Imperial throne of Trantor. Here in the great multidomed capital of the Galactic Empire, 40 billion people have created a civilization of unimaginable technological and cultural complexity. Yet Cleon knows there are those who would see him fall - those whom he would destroy if only he could read the future.

Thirteen hundred gates have opened to solar systems around the galaxy. But as humanity builds its interstellar empire in the alien ruins, the mysteries and threats grow deeper. In the dead systems where gates lead to stranger things than alien planets, Elvi Okoye begins a desperate search to discover the nature of a genocide that happened before the first human beings existed and to find weapons to fight a war against forces at the edge of the imaginable. But the price of that knowledge may be higher than she can pay.

When word of his abilities spreads through the galactic grapevine, Ben ranks number one on an A.I.’s most wanted list to become their cybernated slave. As he’s thrust into an interstellar struggle, Ben discovers a powerful alien hiding on Earth. Determined to protect it, he must outmaneuver relentless enemies, decode cryptic warnings, and determine whether a headstrong spaceship is friend or foe. The fate of more than just his own survival is at stake, and if he fails, the entire universe could pay the price.

Ben and the crew have set course for an alien planet, but the inhabitants are far from what they expected. They have answers that could get their baby Viraquin home, but Ben isn’t sure he’s willing to pay the price for the well-guarded secret. En route to the planet, they receive a distress call from a crippled ship and are bound by law to help. The life support system onboard is failing and the crew is dying. Ben and Lois are their last hope. A power coupling is easy enough to get to ensure their survival… they just have to plunder it from another ship.

It's fall 2007. A well-timed leak has revealed that the US government might have engaged in first contact. Cora Sabino is doing everything she can to avoid the whole mess, since the force driving the controversy is her whistleblower father. Even though Cora hasn't spoken to him in years, his celebrity has caught the attention of the press, the internet, the paparazzi, and the government - and with him in hiding, that attention is on her. She neither knows nor cares whether her father's leaks are a hoax and wants nothing to do with him.

Earth’s been toast for five years—ever since the aliens showed up, killed half the population, and penned the rest like cattle. Master Sergeant Sol Winters leads a ragtag resistance team that’s barely clinging to relevance, when an alien ship crashes in his backyard carrying the princess of the empire and her grumpy bodyguard. She claims she’s here to make peace. Sol’s pretty sure she’s lying—but if she’s not, she might be humanity’s only shot at survival.

With the Destroyer of Worlds still missing and evil lurking around every corner, the Guardians and their human helpers find themselves in a brutal fight to save The Dahn. With creature attacks on the rise and a shocking betrayal within their own ranks, time is running out.

The Terran Republic is falling apart. Former colonies declare their independence, plunging the galaxy into chaos. In a devastating battle, the Terran star cruiser Proxima barely escapes the combat zone. On the retreat, the Proxima fights for survival and becomes a pawn in a confusing war. But Captain Zadiya Ark and her crew have no idea that fate has even harsher blows in store for them.

Nobody likes being on agricultural rotation, and with this heat wave, it’s almost more than Ester can take. She’s itching for something she can’t put words to—something she has no memory of wanting. But then, she can’t remember much beyond the past couple of years. She’s sent to the husband archive for a cure, but the man she checks out comes with baggage: stacks and stacks of paper he calls “books.” What they teach each other may prove hard to forget.

For nearly a decade Garak has longed for just one thing—to go home. Exiled on a space station, surrounded by aliens who loathe and distrust him, going back to Cardassia has been Garak's one dream. Now, finally, he is home. But home is a world whose landscape is filled with death and destruction. Desperation and dust are constant companions and luxury is a glass of clean water and a warm place to sleep.

Vanessa doesn't have the luxury of building a happily ever after on a new planet like her fellow alien abduction survivors. She must get back to Earth. Her family needs her, and she can't afford to let them down again. So, she'll find a way to break Clecanian law and get home—even if she has to marry (and betray) a sexy space pirate to do it. Fejo can't believe his luck when Vanessa, a gorgeous human with a sharp tongue, chooses him as her husband. He doesn't know what he did to win her favor, but he's determined to do everything in his power to make her happy.

There is one thing every enemy of Bethany Anne finds out: They will be ground under her heels. Now, something is heating up between Bethany Anne and Michael, and it isn’t her anger over him leaving her behind. Well, much. Further, the Patriarch is learning there might be someone worth sticking around for in his future. If she would just stop being so hard-headed.

After traversing the dangerous Dead Zone, Zac has finally managed to save his sister and bring her back to Port Atwood. But Zac knows he can't relax. Not if he wants to keep her safe. The foreign factions keep spreading their influence, and ancient foes have set their sights on Earth. With his newfound abilities, Zac has joined the Limited Hunt to gain the strength needed to protect his family and his world. However, the System is unwilling to let Zac train in peace, and the hunt is not what it seems...

Commander David Bryce returned from his mission, successful, with a derelict alien ship that wasn’t as empty as predicted. With the assistance of an old ally, David is hell-bent on stopping the invasion before it begins. There’s just one problem; the Signal is hidden somewhere on Earth. Atlas Donovan is the only man capable of helping them, and it’s unclear whether he can trust the ORB employees. One thing is clear: Aliens have been to Earth, and from the looks of it, not just a single race. There were two.

Following their successful mission to destroy the slaver ring in New York City, Wic and the members of Phantom Team pass through the Antarctic’s origin ring and find themselves deep in the heart of the Androchidan Empire. But as the scope of the alien specie’s operation becomes apparent, Phantom Team realizes they can’t standby as humanity is culled into submission. Efforts must be made to slow the enemy’s progress, if not stop it altogether.

Zac has managed to secure his island for the time being, growing into a true powerhouse through his endless struggles. However, becoming the strongest man in the world does not come without complications. A target has been placed on his back. Natives, aliens - everyone has their eye on the throne. Even the System itself seems intent on forcing him into one desperate situation after another. Zac knows he is running against the clock in his mission to find his family, prompting him to set out to New Washington in search of answers.

When COVID-19 sweeps through New York City, Jamie Gray is stuck as a dead-end driver for food-delivery apps. That is, until Jamie makes a delivery to an old acquaintance, Tom, who works at what he calls “an animal rights organization”. Tom’s team needs a last-minute grunt to handle things on their next field visit. Jamie, eager to do anything, immediately signs on. What Tom doesn't tell Jamie is that the animals his team cares for are not here on Earth. Not our Earth, at at least. In an alternate dimension, dinosaur-like creatures named Kaiju roam a warm and human-free world.

Arlo Lewis was resigned to his station in life as a supply hauler for one of the Primary Corporations ruling Earth, until an acquisition forces him to re-evaluate his situation. When he’s hand selected to lead SeaTech’s Race team, he struggles to return to the competitive field he abandoned as a teenager. With an eager team, and the promise of a better future, Arlo takes on the challenge, only to find more at stake than the rights to Proxima. Under the threat of a revolution brewing at the finish line, things don’t go as expected.

Naval Officer Jack Samson thought a posting to the frontier of human-inhabited space was the death blow to his career. He couldn't have been more wrong. A routine inspection of a small merchant vessel leads to devastating loss and the discovery of strange, fascinating objects. As astonishing discoveries unfold, a mysterious and hostile ship proves that Samson has a competitor in unlocking the secrets of an ancient alien civilization and that humanity might not be alone in the galaxy after all.