Employer: Basso [Stonemarket - Basso's Office]
Availability: You get the opportunity to start this mission, after you have completed the sixth chapter of the game. You need to meet up with Basso again, at the Crippled Burrick tavern.
Your destination has been presented in the above screenshot - it is located in the Southern part of South Quarter, in [South Quarter / Riverside - Canal]. Before you start this side mission, you first need to make sure that Garrett is equipped with, at least one Rope Arrow, because otherwise, it will be impossible to complete this mission.
Approach the destination from the West. Find a big hole in the ceiling and use the Rope Arrow. After you reach the higher level, force open the window to the hideout of the gang leader [South Quarter / Riverside - Jeb Chokes' Hideout].
RIGHT AFTER you enter the apartment, hide in the dark corner, to the left of the starting point. Wait for Jeb to approach and neither move, nor stand up, to avoid being spotted (the above screenshot). As soon as the bandit turns away, approach him and steal the scissors (Thief-Tally Scissors - 50G) attached to his belt.
This job wends here. But if you still want to explore the rest of the apartment, you need to be absolutely quiet here (assuming that you do not want to knock out Jeb). Squeeze behind Jeb to the neighboring room (watch out for the broken glass!) and hide in shadows, before he turns again and walks towards the starting point. Now, start exploring the apartment and try to do that "in turns". Each time Jeb appears round again , hide. In this location, you can find a Bracelet - 8G, an Ink Bottle - 3G and a notebook (South Quarter - Jeb Chokes' Notebook). Finally, try to press the switch hidden behind the vase and explore the stash to find a brooch (Flowers Eternal - Iris Brooch). The best way to leave the apartment is by taking the window here, thanks to which you will not have to bother about Jeb again.