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 Western part of the South Quarter, in [South Quarter / Riverside - Riverside Rooftops]. The way to get there has been presented in the description of the game's storyline, at the page entitled reach the South Quarter (a visit to the City after you have completed the game's second chapter ). Note - before you set out, make sure that you have the Wrench on you. Apart from that, you could also get a Razor, because this will allow you to steal the poet's all belongings.
After you reach the South Quarter [South Quarter / Riverside - Baron's Way North] go South, while remembering to keep to shadows and avoid the guards. Stop after you reach the big balcony shown in the above screenshot, where there is an opponent with a crossbow (occasionally, also another guard will appear here). Wait for him to go left, hop over the Southern balustrade and turn West. Go through the narrow path between buildings and force the window, along your way, open.
After you walk through the window, you will walk into a new location [South Quarter / Riverside - Riverside Rooftops]. Jump down to a lower level here and turn towards the Southern ledge. Climb onto that ledge and force a new window open, which will gain you access to the poet's apartment [South Quarter / Riverside - Poet's Abode].
In the poet's apartment, there are a few items, i.e. a Knife - 2G, a Water Arrow, a Hairbrush - 10G, a Newspaper - Beware of Over-active Imaginations! And a painting (The Court of Montonessi - Rutting Out of Season), which you can obtain only by using the razor. The most important, however, is to obtain the five fragments of a poem and many of them are, unfortunately, well hidden. The first fragment (South Quarter - Poem Fragment One) is on the cupboard shown in the above screenshot, which is located at the apartment's upper floor. Garrett needs to climb onto that cupboard.
The second fragment (South Quarter - Poem Fragment Two) can be found in the chest at the apartment's upper level.
The third fragment (South Quarter - Poem Fragment Three) can be found at the apartment's upper level, on the floor on the right side of the bed. This one is hidden behind another item so, it is not that easily spotted.
The fourth fragment (South Quarter - Poem Fragment Four) can be found in the secret area at the apartment's lower level. You can access this room by using the wrench on the venting shaft grate shown in the above screenshot. Walk through the shaft and close the chest that you find there, thanks to which you will locate the document.
The final, fifth fragment (South Quarter - Poem Fragment Five - 50G) is in the desk's drawer, at the apartment's lower level. At this point, this mission ends.