The Memory Den (quest)

The Memory Den is a side quest in Fallout 4.

Quick walkthrough
This quest is obtained by entering the Memory Den in Goodneighbor, at any time before rescuing Nick Valentine, and convincing Irma to take the player on as a client (either with an easy Charisma check or an upfront payment of 100 caps). The player character is invited to sit in a memory lounger to relive a recent memory, which is always the kidnapping of Shaun. Once the player character emerges from the lounger, it is possible to pass a medium Charisma check and get a refund. Regardless of how the conversation goes, Irma mentions that she knows a good detective in Diamond City that will be able to help find Shaun, who happens to be Nick.