Employer: Basso [Stonemarket - Basso's Office]
Availability: You receive the opportunity to start this mission, after you have completed the game's second chapter. You need to meet up with z Basso w in the Crippled Burrick tavern.
Your destination has been shown in the above screenshot - it is located in the [Stonemarket - Baron's Way South] district, which you can reach, among others, by crossing the Southern part of the City center. Before you set out for this mission, make sure that you are equipped with the Wrench, which you can buy from the local merchants. This will ensure you safe access to the item that you are searching for.
Find the Crowley Stonecutters building and pick the lock to gain access [Stonemarket - Crowley and Sons]. Once inside the building, go to the cellar. Do not attempt to approach the statuette, because the approach is secured with a trap. Instead, use the wrench on the nearby plaque (City Heritage Plaques - Barnabus Northcrest's Obelisk) and press the button to deactivate the trap. You can now collect the bust (Baron's Bust - 25+50G), but you will also find a Journal (Stonemarket - Sculptor's Diary) in the cellar. This mission will then end.