Prerequisite: Priority: Palaven
Listen to the volus standing next to the Elkoss Combine Arsenal Supplies kiosk to the left of the bank podium in the Presidium Commons.
Walkthrough Edithomeworld of Irune in the Aru System of the Aethon Cluster to acquire the book. The Aethon Cluster will not appear on the galaxy map until after completing Priority: Tuchanka.
Note: This mission cannot be completed before Priority: Tuchanka.