In this part, Shepard continues to assist the Primarch and Wrex as the crew of the Normandy works towards curing the Genophage.
Shepard takes down a Cereberus raid on a human colony world.
Shepard then assists the Primarch with a secret "diplomatic" mission that took place on Tuchunka.
It turns out that it was a mission lead by the Primarch's son to disarm a bomb the Turians put on Tuchunka after the Krogan Rebellions.
The catch is Cereberus found it first, so now its a race against time to prevent them from setting it off.
Gameplay wise, I complete all the side quests leading up to the Shroud Mission.
Next time we will be curing the Krogan.
Enjoy, and stay tuned for more Mass Effect.