The Countess & The Endgame Walkthrough Part 3
Walkthroughs for Blackwell Convergence
The Gold Tech Connection
Head back to the apartment and have Rosa search for Gold Tech on the internet. Once she has discovered this clue you can return to The Roosevelt Island Lighthouse and talk to the old man with Rosa.
Knowing the old man's name, and the story about his son, is the key to getting him to talk. Explore the various dialogue options, paying special attention to anything related to his son, Gold Tech, or Lazarus. These are the key points that Rosa will need so that she can make the connections. After your conversation with Marty Goldwater, head back to Rosa's apartment.