I found 2 Unusual Gems (one I found in Kodlak's Room). So I got a quest to bring that gem to house mark near Riften. When I reach there, the house door is locked and only unlocked with key!
Am I missing something? What am I supposed to do?
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Sign up to join this communityOne of the things you can do is show it to Maul, the Nord who accosts you when you first enter Riften. He will direct you to Vex, in the Thieves Guild, who starts the next quest, No Stone Unturned.
You cannot access Vex without joining the Thieves Guild, so if you're interested in completing the quest, you'll have to join up.