Traitor or Victim
Locations: Nexus, Kadara
Pick this one up in Director Tann's office, sometime after Kadara becomes available. A pale Turian named Sellers has been waiting for help in the lower lounge.
He believes his friend was kidnapped by Exiles, rather than joining the mutiny. Agree to check it out and you'll discover Sellers was right- his friend's body is stuffed into a corner outside the upper level of Tartarus, in the Kadara slums.
Scan the body and read his datapad to close out the mission, though Sellers will later send an email with his thanks.