Life on the Frontier

You've received an email from Sid, Vetra's sister, who thinks she has uncovered something suspicious going on at the Nexus.

Nexus interests have been attacked by the mercenary group called the Three Sabers. Vetra's sister Sid thinks there's something suspicious going on, as the Three Sabers seem to have detailed knowledge of Nexus plans and movements.

Acquisition
After you have completed Vetra Nyx: Means and Ends and visited Kadara, there is an email titled "Something suspicious" from Sid. Acknowledge it to start the mission.