From audible.com:

They slept for hundreds of years, dreaming of a new home in the Andromeda galaxy. When finally they awake, their dreams of peace are shattered. These colonists - turian, salarian, asari, human, and more - face an uncharted galaxy and threats beyond understanding.

The Nexus is the core from which the colonists will explore their new home. Yet even before the arks arrive, the massive space station sustains critical damage. The entire mission is placed in jeopardy, and security director Sloane Kelly must reassert order while racing to identify the nature of the threat that faces them.

If she fails, the Andromeda Initiative could crumble.

From audible.com:

Lieutenant Cora Harper joined the Systems Alliance to develop and enhance her powerful biotic talents. She was assigned to the asari commando unit Talein's Daughters, where she honed her abilities to become a skilled and deadly huntress.

Returning to Earth, Cora finds herself a stranger among other humans, and joins the Andromeda Initiative as Alec Ryder's second-in-command. The mission will send 100,000 colonists on a one-way, 600-year-long journey into the unknown. When essential - and dangerous - tech is stolen, Cora is assigned to recover it before it can be used against the Initiative, and end the mission before it can begin.

From audible.com:

With a new game, Mass Effect Andromeda, set for release in 2017, the launch of a new series of Mass Effect novels is timely. The new game will take the story in a dramatic new direction and is set in a new region of space, with a new and deadly enemy.

Titan is publishing four unmissable Mass Effect novels. The novels will act as prequel and sequels to the events in the games and will become part of the overarching Mass Effect saga. These new stories, developed in close collaboration with the Bioware game team, weave directly into the action of the new game - and will reveal events kept secret over the course of game play - and will add to the canonical Mass Effect saga.