Shoot it the moment you see it.
From Fallen London Wiki
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From: A rat in a sewery maze
The tide will rise soon. You don't want to be trapped down here.
Game Instructions: (Without 
A Name Scrawled in Blood) This will complete the bounty and make your name, unlocking new stories.
Challenge information
- 11 - very chancy (44%)
- 13 - chancy (52%)
- 16 - modest (64%)
- 18 - very modest (72%)
- 21 - low-risk (84%)
- 23 - straightforward (92%)
- 25 - straightforward (100%)
Broad difficulty is equal to Quarry's Savagery. Reduce it for easier hunting.
Success
A bullet between the eyes!
Good God, it's a big one. […] You are faced with the unpleasant task of deciding which part of the rat you should cut off in order to prove your kill. We will gloss over the details of that process. You have enough to satisfy the Department.
[Find the rest of the story at https://www.fallenlondon.com]
Dangerous is increasing…- Dangerous is increasing… (+10 CP, up to level 200 +
Dangerous Gains) 
'Quarry's Savagery' has been reset: a conclusion, or a new beginning?
Redirects to: Returning to the Department
Failure
Unbelievable - it got away!
This thing is really hard to kill. It's still not badly injured enough for you to catch it.
- Dangerous is increasing…
- You've lost 1 x Quarry's Savagery
You now have 2 x Quarry: Confounded Thing is Hiding
Redirects to: Hunting across London
