Read an improvised fighting manual
From Fallen London Wiki
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From: Read incoming mail
An acquaintance has shared some of their fighting techniques.
Game Instructions: This will consume the Improvised Dueling Manual and increase your dangerous.
Unlocked with 
1 x Improvised Dueling Manual (Write down some favoured fighting techniques)
Success
Tales of daring
Some of your acquaintance's descriptions of their exploits are a little exaggerated. But the underlying ideas are solid – no doubt you'll soon have a chance to try them out.
You've gained 1 x Hard-Earned Lesson (up to 20)
You've lost 1 x Improvised Dueling Manual
Dangerous is increasing… (+see below CP, up to level 200 + 
Dangerous Gains)
You've gained 1 x Mired in Mail
Starting  Mired in Mail | 0–3 | 4 | 5 | 6 | 7 | 8 | ≥9 |
|---|---|---|---|---|---|---|---|
| Dangerous CP[1] | 70 | 69 | 63 | 42 | 21 | 15 | 14 |
| Ending Mired in Mail | 1–4 | 5 | 6 | 7 | 8 | 9 | ≥10 |
- ↑ Assumes level 69+. Lower levels gain less CP
