Pinned Main Story, The Institute Quest
This quest will be triggered or can be aquired when you complete Mass Fusion quest.
Stages of "Pinned" quest
2. Reach the House
A team from the Institute was sent into the Commonwealth to secure someone who can help with the reactor. I need to make sure they're all right.
4. Eliminate the Opposition
Kill the gunners.
6. Speak to Wallace
T. S. Wallace has been invited to join the Institute. He needs to be convinced it's the right thing to do.
You should convince him to go with you. If you fail, Enrico will call a synth to subdue Wallace.
7. Quest completed
Mr. Wallace has been safely delivered to the Institute.
Next / new quest is Powering Up (Main Story, The Institute).