Pinned

Pinned is an Institute main quest in Fallout 4.

Quick walkthrough

 * 1) Speak to Father.
 * 2) Reach the house.
 * 3) Speak to Minutemen contact.
 * 4) Speak to Enrico Thompson.
 * 5) Speak to T.S. Wallace.

Detailed walkthrough
The quest starts when you enter the Institute after finishing Mass Fusion. First, you must speak to father, then you are told to go to the house of T.S. Wallace; a wastelander who could help the project. The Minutemen arrive there, and from here you have three choices:
 * Kill the Minutemen,
 * Side with them,
 * Convince the Minutemen to stand down.

If they either stand down or get killed, you must then go into the house of Wallace, where another speech check is required in order to get him to go to the Institute.