-- STP is Sterling Temp Placement. The guy who works here has a good working knowledge of the concept of confidentiality, which I can't fault him for, but he's also a jerk. We need to bring more pressure to bear.
Hint 3
To do that, you'll need the press pass you hopefully picked up from Jeremy's office at the City Post, and some more information about STP from Tiffany.
Hint 4
Return to Tiffany after you've talked to the Sterling guy and ask about Sterling. She says she was fired by them, and if you read the letter on the table again, it starts to make sense. Asking about Ken starts to open the flood gates, but she gets suspicious and shuts down again.
Hint 5
Go back to Sterling and show the jerk the press pass. He's not overly impressed, but it's time to play dirty.
Hint 6
Keep asking questions until you have the option to "resort to blackmail." This will get you your next contact --