Duplicity

Duplicity is a story set in the near future and it's about a female police detective investigating a crime. Someone pushed an employee of a high tech company off a balcony and she wonders what it has to do with a computer chip found clutched tightly in a death grip in the dead man's hand. She notices someone watching the scene and right after that, finds another chip--in much better condition than the first.
Is the man in the crowd a secret admirer or the perpetrator? She soon gets deeper into the case and things start to unravel--not always in a good direction, either.