A Rat in a Sewery Maze

SPOILERS AHEAD! BE WARNED!

They say there are seven labyrinths in London. Does this count as one of them? It's not very grand. The air is ripe with primordial stenches, and you may need a new pair of boots. Where is that wretched beast?

Unlocked with a redirect from You know where the Rat is lairing...

Wiki note: There are two options which share the same name of "Explore its lair thoroughly before it returns", but the second one will cost you 1 Fate.

Options:

Shoot it the moment you see it.

Spoiler
Challenge information

Broad, Dangerous 15
|| 11 - very chancy (41%) || 13 - chancy (51%) || 16 - modest (61%) || 18 - very modest (71%) || 21 - low-risk (81%) || 23 - straightforward (91%) || 25 - straightforward (100%)

Broad difficulty is equal to Quarry's Savagery. Reduce it for easier hunting.

Success

A bullet between the eyes!
- Dangerous is increasing…
- Dangerous is increasing… (+10 CP, not beyond 50)
- 'Quarry's Savagery' has been reset: a conclusion, or a new beginning?
Redirects to: Returning to the Department

Failure

Unbelievable - it got away!
- 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
^

Explore its lair thoroughly before it returns.

Spoiler
Challenge information

Broad, Dangerous 24
|| 17 - very chancy (41%) || 21 - chancy (51%) || 25 - modest (61%) || 29 - very modest (71%) || 33 - low-risk (81%) || 37 - straightforward (91%) || 40 - straightforward (100%)

Broad difficulty is related to Quarry's Savagery. Reduce it for easier hunting.

Success

A nest of squirming monsters!
- Dangerous is increasing…
- Dangerous is increasing… (+12 CP, not beyond 50)
- You've gained 50 x Rat on a String
- 'Quarry's Savagery' has been reset: a conclusion, or a new beginning?
Rare Success

A nest of squirming monsters!
- Dangerous is increasing…
- Dangerous is increasing… (+12 CP, not beyond 50)
- You've gained 50 x Rat on a String
- 'Quarry's Savagery' has been reset: a conclusion, or a new beginning?
- You've gained 35 x Phosphorescent Scarab
- Your 'Quarry: Confounded Thing is Hiding' Quality has gone!
- Your 'Your Quarry: Wariness' Quality has gone!
- You no longer have a quarry.
- Your quarry will no longer be tempted by poisoned bait.
Failure

Too slow...
- Dangerous is increasing…
- You've lost 1 x Quarry's Savagery
- You've gained 4 x Quarry: Confounded Thing is Hiding
^