One Good Turn Deserves Another

One Good Turn Deserves Another is an optional side quest in Deus Ex: Human Revolution.

Meet with Greg Thorpe
This quest is initiated by reading an email sent to Jensen's workstation computer. If you saved both Greg and Josie Thorpe at the Sarif Manufacturing Plant, and talked to Greg before returning to Sarif Industries, the email will be available.

The email states that Greg wants to thank Jensen and asks him to visit them at their home in their apartment building, behind Grayson's gas station. After traveling there, in his conversation with Greg Thorpe, Adam hears about a weapon dealer named Seurat and is told to use Greg's name when dealing with him for a discount.

This completes the quest and awards 750 XP.