A Light In The Darkness is a side mission available in New Atlantis in Starfield.
Your objective is to supply information to Nadia Muffaz at SSNN.
Here’s a walkthrough and guide of A Light In The Darkness in Starfield.
To begin the mission, talk to a guy near the Shipbuilding Services in Spaceport of New Atlantis.
He’ll tell you about Nadia Muffaz at SSNN.
Talk to Nadia Muffaz
Go to the Commercial District to see Nadia Muffaz in the SSNN building.
She’ll ask you to deliver news on many things (other missions).
Deliver news about the Scow and Captain Petrov
After you’re done with the Captain Petrov mission “No Sudden Moves“, talk to her about it. You’ll earn 1050 credits.
Deliver news about the Vectera mining attack
You can deliver the news on the Vectera mining attack that happened at the start of the game. You’ll earn 1050 credits.
Deliver news about the GalBank robbery in Akila City
This one is related to The Empty Nest when you went to Akila City with Sam Coe. The reward is 1050 credits as well.
Deliver news about Ron Hope’s death
If you had killed Ron Hope in the Freestar Collective mission, then deliver the news to Muffaz for 1200 credits.
Deliver news about the Terrormorph attack
After you’re done with Eyewitness, you can report on the Terrormorph attack on New Atlantis’ Spaceport. This is part of the United Colonies mission.
Deliver news about SysDef’s attack on The Key
This one’s related to Legacy’s End, i.e the last mission in the Crimson Fleet mission-line.
There may be more news other than this, but this SSNN mission seems to complete after Final Glimpses.