Book 1

Every advanced society in the galaxy relies on the technology of the Protheans, an ancient species that vanished fifty thousand years ago. After discovering a cache of Prothean technology on Mars in 2148, humanity is spreading to the stars, the newest interstellar species struggling to carve out its place in the greater galactic community. On the edge of colonized space, ship commander and Alliance war hero David Anderson investigates the remains of a top secret military research station: smoking ruins littered with bodies and unanswered questions. Who attacked this post, and for what purpose? And where is Kahlee Sanders, the young scientist who mysteriously vanished from the base hours before her colleagues were slaughtered? Sanders is the prime suspect, but finding her creates more problems for Anderson than it solves. Partnered with a rogue alien agent he can't trust and pursued by an assassin he can't escape, Anderson battles impossible odds on uncharted worlds to uncover a sinister conspiracy - one he won't live to tell about. Or so the enemy thinks.

Book 2

Ascension

by Drew Karpyshyn

Published 1 January 2008
When they vanished fifty thousand years ago, the Protheans left their advanced technology scattered throughout the galaxy. The chance discovery of a Prothean cache on Mars allows humanity to join those already reaping the rewards of the ancients’ high-tech wizardry. But for one rogue militia, the goal is not participation but domination.

Scientist Kahlee Sanders has left the Systems Alliance for the Ascension Project, a program that helps gifted “biotic” children harness their extraordinary powers. The program’s most promising student is twelve-year-old Gillian Grayson, who is borderline autistic. What Kahlee doesn’t know is that Gillian is an unwitting pawn of the outlawed black ops group Cerberus, which is sabotaging the program by conducting illegal experiments on the students.

When the Cerberus plot is exposed, Gillian’s father takes her away from the Ascension Project and flees into the lawless Terminus Systems. Determined to protect Gillian, Kahlee goes with them… unaware that the elder Grayson is, in fact, a Cerberus operative. To rescue the young girl Kahlee must travel to the farthest ends of the galaxy, battling fierce enemies and impossible odds. But how will she be able to save a daughter from her own father?

This novel is based on a Mature-rated video game.

Book 3

Retribution

by Drew Karpyshyn

Published 1 January 2010
Humanity has reached the stars, joining the vast galactic community of alien species. But beyond the fringes of explored space lurk the Reapers, a race of sentient starships bent on “harvesting” the galaxy’s organic species for their own dark purpose.

The Illusive Man, leader of the pro-human black ops group Cerberus, is one of the few who know the truth about the Reapers. To ensure humanity’s survival, he launches a desperate plan to uncover the enemy’s strengths—and weaknesses—by studying someone implanted with modified Reaper technology. He knows the perfect subject for his horrific experiments: former Cerberus operative Paul Grayson, who wrested his daughter from the cabal’s control with the help of Ascension project director Kahlee Sanders.

But when Kahlee learns that Grayson is missing, she turns to the only person she can trust: Alliance war hero Captain David Anderson. Together they set out to find the secret Cerberus facility where Grayson is being held. But they aren’t the only ones after him. And time is running out.

As the experiments continue, the sinister Reaper technology twists Grayson’s mind. The insidious whispers grow ever stronger in his head, threatening to take over his very identity and unleash the Reapers on an unsuspecting galaxy.
 
This novel is based on a Mature-rated video game.

Book 4

Deception

by William C. Dietz

Published 31 December 1969
An all-new adventure inspired by the award-winning videogame from BioWare!

The universe is under siege. Every fifty thousand years, a race of sentient machines invades our galaxy to harvest all organic life-forms. They are the Reapers.

Two people who know the truth are desperately searching for a way to stop the cycle: Navy admiral David Anderson and his partner, Kahlee Sanders. They have uncovered grisly evidence proving that the Reaper threat is real. But in so doing they have exposed the machinations of Cerberus, a secretive paramilitary organization, and its mysterious leader, the Illusive Man—putting David and Kahlee in mortal danger, for Cerberus will stop at nothing to protect its secrets.

But along the way, they find an unlikely ally in Gillian Grayson, a young woman with extraordinary powers. Once the subject of horrifying scientific experiments, Gillian is now free—and beginning to master her deadly abilities. But after learning that Cerberus was responsible for the death of her father, Gillian swears vengeance against the group and the Illusive Man—threatening to unravel everything Kahlee and David are fighting for.

Books 1-4

Mass Effect

by Drew Karpyshyn and William C. Dietz

Published 1 December 2008