The An Eye for and Eye scenario, found in the Game Master's Guide and the Tome of Adventure is a short, excellent scenario to begin your Wahammer 3e adventures.
The second chapter of the scenario revolves around an investigation and is somewhat free-form.
The fan provided clue cards and additional material help the GM organize the chapter, add some nice flavour, and help keep the investigation moving forward.
Take a look a the document section for the clue cards, a guide/key, and a map.