In Noir, the whole group is collectively representing one private detective with unconventional methods.

Instead of Forensic Contacts, players have 4 action cards they can use at any point and any moment:

Spy
Break-In
Bribe
Intimidate

You won't be able to intimidate everyone without repercussions. 
Also, your money is in a shortage, so you can't bribe everyone you meet.
Noir really brings another side to crime busting!

This Expansion requires the base game (London) to be played. It also requires an app to work (it's impossible to play without it), but once downloaded no Internet connexion is needed to play.