The volus will be left on his own and will tell you that Fade is Harkin, the ex-C-Sec officer who originally told you where to find Garrus in the first game. You can shoot the krogan with a Renegade interrupt, but you don't need to fight them, so if you're playing a Paragon Shepard just ignore the prompt and Garrus will scare them off anyway. Head over to the warehouse and you'll meet a volus with two krogan bodyguards. You can locate the warehouse area of the Citadel on the western side of the minimap. He'll tell you to go to the warehouse, where one of Fade's agents is currently operating out of. Speak to Captain Bailey on the right and ask about Fade. When you land, go straight through to C-Sec, which is the first location you'll encounter after walking through customs.
The first thing you need to do after acquiring this mission is head to the Citadel.
