Here's a walkthrough and hints for Discworld Noir. The Walkthrough is a straight solution for the game, and the hints are more er, hinty - featuring gentle hints, nudges, and finally spoilers for the game. The latter may be better for you if you don't want to spoil the entire game and are just stuck with one problem. These will be tidied up later since they're a bit messy and non-htmled at the moment.
helping handNoir Hints

helping handNoir Walkthrough