Jewel of the Commonwealth

Jewel of the Commonwealth is a quest that is obtained within the Commonwealth, in Fallout 4..

Synopsis
As the Sole Survivor continues their search for the kidnapped baby Shaun, they come across a thriving city within the ruins of Boston, called Diamond City by its residents. Where there are people, there is trouble, and Diamond City will turn out to be no different as the search continues within its walls.

Walkthrough
This quest becomes available as the Sole Survivor happens across Diamond City. Alternatively, there are various NPCs that will mention Diamond City and its location, which will begin the quest to find the city, first.
 * 1) Upon arrival at Diamond City, the Sole Survivor will witness a confrontation between Piper Wright, the owner of the city's local newspaper Publick Occurrences, and McDonough, the mayor of the city. Being brought into this confrontation, the Sole Survivor's kidnapped baby comes into the equation, which leads to the mayor revealing that he cannot spare the city's security force to help with this incident, and then reveals that there is a local private detective by the name of Nick Valentine that can help, instead.
 * 2) Upon arrival at Valentine's place of business, his secretary will make mention that Valentine is nowhere to be found, and disappeared while on a case of tracking down a run-away daughter. The Sole Survivor will then track down Valentine (story is continued in the quest: Unlikely Valentine), and afterwards, he will offer to help find the kidnapped baby Shaun.