Nigel Shirazi was first in line for the chairmanship of Asbaran Solutions, one of the prominent "Four Horsemen" mercenary companies. First in line...until his drinking and temper caused him to fail out of college and get disinherited by the family. Now he leads the life of a playboy, enjoying a stipend from the family to stay out of the way. But someone is out to get his family, and Nigel is all that stands between the hidden enemy and the destruction of Asbaran Solutions and the Shirazi family.

The slaughter is on! Across the galaxy, human mercenaries are being ambushed, and an ever-increasing number of companies aren't returning from their contracts. Someone even appears to be plotting the demise of the premier Four Horsemen companies, and disaster for the other three companies has only been averted by the narrowest of margins. Sansar Enkh, the president of The Golden Horde, knows her company is likely to be next, but has no idea who is behind the attacks, or when they will strike her beloved Horde.

Heir to one of the leading "Four Horsemen" mercenary companies, Jim Cartwright is having a bad year. Having failed his high school VOWS tests, he's just learned his mother bankrupted the family company before disappearing, robbing him of his Cavalier birthright. But the Horsemen of eras past were smart - they left a legacy of equipment Jim can use to complete the next contract and resurrect the company.

It's the 22nd Century. The galaxy has opened up to humanity as a hyperactive beehive of stargates and new technologies, and we suddenly find ourselves in a vast playground of different races, environments, and cultures. There's just one catch: we are pretty much at the bottom of the food chain. Enter the Four Horsemen universe, where only a willingness to fight and die for money separates Humans from the majority of the other races. Enter a galaxy not only of mercenaries, but also of Peacemakers, bounty hunters, and even a strung out junkie.

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. 

Peacemakers. The Galactic Union's most capable enforcers and resolute negotiators, their name alone elicits fear and awe among the Union's citizenry. Having completed a harrowing confirmation mission, Jessica Francis stands ready to become Earth's first Peacemaker and believes obtaining her commission is a mere formality. However, certain members of the Guild question her ability. Worried that she'll fall back on her mercenary ways, they want Jessica to prove her mettle.

Abraham Murdock left his home of Sheridan, Arkansas, at 17 to start a merc career that spanned almost 50 years, working for dozens of companies, killing aliens and getting paid across the galaxy. Near the end of his career, he landed a gig with Cartwright’s Cavaliers. The storied Four Horsemen unit was just coming back from near catastrophe, and the battle-proven Murdock was an ideal choice for their top sergeant. It would have been a perfect last contract, but then his dropship was destroyed in the Chimsa system, killing the flight crew and him. Or did it?

With Alexis Cromwell shot in the back by her XO and the fleet in ruins, the Humans have run back to New Warsaw to lick their wounds, but the Merc Guild now knows the location of their hidden base, and they are in hot pursuit. Led by the New Era, a dreadnought built for the sole purpose of destroying humanity, they are an unstoppable force.

For Colonel Mulbah Luo and the Kakata Korps, their initial contracts with the Mercenary Guild had them defending Earth. Honest work, they were led to believe, keeping the citizens of Earth safe from alien pacification in their own way. As the occupation continues, however, their eyes are opened to the fact that the hand gripping their throat is slowly tightening.

Bjorn Tovesson III, the owner of Bjorn’s Berserkers, is a man tied to the past but who’s not afraid to innovate. Whether it is new tactics or new equipment, Bjorn is willing to try anything once, in an effort to grow his company into the status of the fabled Four Horsemen. Looking to the future with his eyes open, though, he has seen a series of unfortunate occurrences running through the ranks of Earth’s mercenaries. Companies in financial troubles, some taking huge losses on contracts...and others not returning from their contracts at all. 

The Omega War is in full swing. Earth has fallen to General Peepo’s army, and the surviving human mercenaries have taken refuge at the hidden Winged Hussars’ base in New Warsaw. On Earth, the defensive forces fight to keep the hearts and minds of their fellow humans, but Peepo’s plans are slowly converting the people to her way of thinking, and the Mercenary Guild troops continue to root out the forces arrayed against them.

War has come to the worlds of Humans. The rich planet of Tau-Rietzke, however, is far from Earth and the Mercenary Guild’s invasion, and its alien-registered mercenary companies are a safe haven for humans on the run. Organizations like the Midnight Sun Free Company. Having just completed another successful mission and taken possession of three Raknars, it was party time for Saisho Branco and the Midnight Sun personnel, and they were enjoying a little down time...until the war spilled over into their corner of the galaxy and two competing organizations showed up to steal the Raknars.

After a stunning victory at the Merc Guild shipyard of Golara, the leaders of the Four Horsemen mercenary units of Earth have decided it’s time to take back the colonies the Merc Guild has captured, and the Horsemen split up to liberate them. While the Merc Guild still has humanity outnumbered, Alexis Cromwell, the leader of the Winged Hussars, has incorporated the ships captured in Golara into her fleet, and she hopes the Humans can achieve local superiority across four systems with her new battleships and her Egleesius cruisers.

The Omega War is in full swing. Earth has fallen to General Peepo’s army, and the surviving human mercenaries have taken refuge at the hidden Winged Hussars’ base in New Warsaw. As humanity begins to think about how to recover the planet, one thing is obvious - more powerful weapons of war will be needed in the effort. One of the keys to recapturing Earth will be the Raknar of Cartwright’s Cavaliers, but the power sources of many of the giant mecha have become unusable over the course of history.

When Todd’s critically damaged ship dropped out of hyperspace near the human colony world of Azure, he had no memory of his past. He didn’t know who he was, or even what he was, and the humans didn’t either. That didn’t stop the colonists of Azure - they took him in, anyway...even though they didn’t understand how he could do some of the things he could do. Todd and his descendants consider themselves human - eight-armed and water-breathing - but human, nonetheless. After 70 years living among humans, Todd’s descendants are going back out into the Union to make their mark.