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Humans call them Monument-Makers. An unknown race, they left stunning alien statues scattered on distant planets throughout the galaxy, encoded with strange inscriptions that defy translation. Searching for clues about the Monument-Makers, teams of 23rd century linguists, historians, engineers and archaeologists have been excavating the enigmatic alien ruins on a number of planets, uncovering strange, massive false cities made of solid rock. But their time is running out.

Chaka's brother was one of those who sought to find Haven and never returned. But now Chaka has inherited a rare Roadmaker artifact—a book called A Connecticut Yankee in King Arthur's Court—which has inspired her to follow in his footsteps. Gathering an unlikely band of companions around her, Chaka embarks upon a journey where she will encounter bloodthirsty river pirates, electronic ghosts who mourn their lost civilization, and machines that skim over the ground and air. Ultimately, the group will learn the truth about their own mysterious past.

Everyone knew the legend of Christopher Sim. Fighter. Leader. An interstellar hero with a rare talent for war, Sim changed mankind's history forever when he forged a ragtag group of misfits into the weapon that broke the back of the alien Ashiyyur. But now, Alex Benedict has found a startling bit of information, long buried in an ancient computer file. If it is true, then Christopher Sim was a fraud.

From a remote corner of the galaxy, a message is being sent. The continuous beats of a pulsar have become odd, irregular, and artificial. It can only be a code. Frantically, a research team struggles to decipher the alien communication. And what the scientists discover is destined to shake the foundations of empires around this world - from Wall Street to the Vatican.

When a young physicist unveils an efficient star drive capable of reaching the core of the galaxy, veteran star pilot Priscilla "Hutch" Hutchins finds herself back in the deepest reaches of space, and on the verge of discovering the origins of the deadly Omega clouds that continue to haunt her.

Thousands of years ago, artifacts of the early space age were lost to rising oceans and widespread turmoil. Garnett Baylee devoted his life to finding them, only to give up hope. Then, in the wake of his death, one was found in his home, raising tantalizing questions. Had he succeeded after all? Why had he kept it a secret? And where is the rest of the Apollo cache? Antiquities dealer Alex Benedict and his pilot, Chase Kolpath, have gone to Earth to learn the truth.

Thousands of years after an entire colony mysteriously disappears, antiquities dealer Alex Benedict comes into possession of a cup that seems to be from the Seeker, one of the colony's ships. Alex and his assistant, Chase Kolpath, follow a deadly trail to the Seeker, strangely adrift in a system barren of habitable worlds. But their discovery raises more questions than it answers, drawing Alex and Chase into the very heart of danger.

Priscilla “Hutch” Hutchins discovers an interstellar message from a highly advanced race that could be her last chance for a mission before the program is shut down for good. Hutch has been the academy’s best pilot for decades. She’s had numerous first contact encounters and even became a minor celebrity. But world politics have shifted from exploration to a growing fear that the program will run into an extraterrestrial race more advanced than humanity and war.  

In the year 2204, tragedy and terror forced a scientific team to prematurely evacuate Maleiva III. Nineteen years later, a rogue moon hurtling through space is about to obliterate the last opportunity to study this rare, life-supporting planet. With less than three weeks left before the disaster, superluminal pilot Priscilla "Hutch" Hutchins must lead a small scientific team to the surface to glean whatever they can about its lifeforms and lost civilizations before time runs out.

To boost waning interest in interstellar travel, a mission is sent into deep space to learn the truth about "moonriders," the strange lights supposedly being seen in nearby systems. But Academy pilot Valentina Kouros and the team of the starship Salvator will soon discover that their odyssey is no mere public-relations ploy, for the moonriders are not a harmless phenomenon. They are very, very dangerous-in a way that no one could possibly have imagined.

Priscilla "Hutch" Hutchins has finally realized her lifelong dream: She’s completed a nerve-bending qualification flight for a pilot’s license. Her timing is far from optimal, however. Faster-than-light travel has only recently become a reality, and the World Space Authority is still learning how to manage long-range missions safely. To make matters worse, efforts to prepare two planets for colonization are killing off native life-forms, outraging people on Earth.So there’s not a lot of demand for space pilots.

Forty-one years ago the renowned physicist Chris Robin vanished. Before his disappearance, his fringe-science theories about the existence of endless alternate universes had earned him both admirers and enemies. Alex Benedict and Chase Kolpath discover that Robin had several interstellar yachts flown far outside the planetary system, where they too vanished. And following Robin's trail into the unknown puts Benedict and Kolpath in danger.

A civilization-destroying omega cloud has switched direction, heading straight for a previously unexplored planetary system--and its alien society. And suddenly, a handful of brave humans must try to save an entire world--without revealing their existence.

Sixty years ago, the space yacht Polaris was found deserted, the fate of its pilot and passengers a mystery. Now, to mark the anniversary of the disappearance, there is to be an auction of what was left behind on the ship. Using his insider knowledge, Alex Benedict, one of the preeminent antiquities dealers in the galaxy, secures some of the artifacts.

Centuries after a war with the Mutes, the first aliens to be encountered by humankind, a startling new discovery in the far reaches of the Orion Nebula appears. On a planet with conditions favorable to life, explorer vessel The Columbia comes across a small town seemingly inhabited by an intelligent species not yet discovered. But when a highly publicized follow-up mission is sent to make contact mere months later, the entire town has vanished, leaving no trace—or such is presumed to be the case until Alex Benedict and his archaeological crew show up to investigate.

Interstellar antiquities dealer Alex Benedict receives a cryptic message asking for help from celebrated writer Vicki Greene - who has been mind-wiped. She has no memory of her past life, or of her plea for assistance. But she has transferred an enormous sum of money to Alex, also without explanation. The answers to this mystery lie on the most remote of human worlds, where Alex will uncover a secret connected to a decades-old political upheaval - a secret that somebody desperately wants hidden.

One night, Aaron and Dana go swimming in a man-made lake that sits on an allegedly uninhabited property. They think it's strange that the entrance to the lake has two tall pillars that they have only seen before on graveyard gates. But it doesn't stop them from going in. They are never seen alive again. A year later, Todd Holloway, a struggling musician, moves into the abandoned house next to the man-made lake. Aside from an eerie feeling he gets from the property, it's his dream house. He jumps at the opportunity to buy it at a significantly reduced price. After Todd moves in, he begins to...

Eccentric Sunset Tuttle spent his life searching in vain for forms of alien life. Thirty years after his death, a stone tablet inscribed with cryptic, indecipherable symbols is found in the possession of Tuttle's onetime lover, and antiquities dealer Alex Benedict is anxious to discover what secret the tablet holds. It could be proof that Tuttle had found what he was looking for.

The universe has been explored - and humanity has all but given up on finding other intelligent life. Then an alien satellite orbiting a distant star sends out an unreadable signal. Is it the final programmed gasp of an ancient, long-dead race? Or the first greeting of an undiscovered life form?

When physicist Michael Shelborne mysteriously vanishes, his son Shel discovers that he had constructed a time travel device. Fearing his father may be stranded in time---or worse---Shel enlists Dave Dryden, a linguist, to accompany him on the rescue mission.