Mass Effect: Revelation & Ascension

Released in July of 2008, the second Mass Effect novel is set a few months after the events of the first Mass Effect game. It brings back the character of Kahlee Sanders from the first novel, and digs deeper into an organization known as Cerberus – a radical pro-human military cabal the player can encounter in the first game.
The story also takes a closer look at the quarian species, biotic ability in humans, and introduces the setting of Omega – the Terminus Systems’ dark, twisted counterpart to the Citadel.
Mass Effect: Ascension helps lay the groundwork for the ever expanding ME story and setting, but it won’t spoil anything from the upcoming second Mass Effect game. It does have some things that might be considered spoilers if you haven’t read the first novel or played the first game… so check those out before you buy it.