Enter rooms with a Tlingit warrior near their village until one of them kidnaps you.
You'll awaken inside the slave hut.
-> You get a whois: ...HAS BEEN ENSLAVED BY THE TLINGITS!
Also inside the slave hut should be Stenka, a kidnapped Russian. ASK STENKA ESCAPE.
SAY I PROMISE TO COME BACK WITH HELP.
Note: this appears to be broken as of 14/05/2020, right now you can only SIT BOX and escape losing the possibility of the other two whois options
-> You get a whois: ...HAS PLEDGED TO HELP FREE A TLINGIT SLAVE!
SIT BOX. You are dumped outside with the trash.
You get a whois: ...WAS ENSLAVED BY THE TLINGITS BUT MANAGED TO ESCAPE!
You get xp!
You gain Tlingit enmity.
To free Stenka, choose one course of action:
Find one of Stenka's friends in the Russian fort (Sonov, Teodor, maybe others just replace the name in the following).
ASK SONOV STENKA. He asks what happened to Stenka.
TALK SONOV ENSLAVED BY TLINGITS. Sonov asks if you'll help. SAY YES.
Sonov follows you. Go to the Tlingit village outside the slave hut. Sonov frees Stenka.
...HELPED FREE A COMRADE ENSLAVED BY THE TLINGITS.
You get more xp!
Find the Tlingit man without a name. Kill him and get his carved redcedar key.
Unlock the slave hut and enter. Stenka escapes. You should leave too.
You get xp!
You get a whois: ...CLEVERLY FOUND A WAY TO FREE A TLINGIT SLAVE!
NOTE: This quest needs revision, when I attempted the Sonov route he requested proof Stenka was alive, and I didn't have time to investigate