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.

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.

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.

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.

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?

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.

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.

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.

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.

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.