Just use the mural torch to unlock the door.
I must have missed that.
But I found that if I changed into exploration mode, I could talk to the bloke through the wall, kill him & advance the story without entering the room.
You should have got the oranges quest from Anfa's young King. It is not mandatory to complete it if your prestige is high enough already. You still may get back to Anfa to complete it later on. One clue is got from the guy with the donkeys problem, one is found is the nearby house. One is got from a sick merchant in Anfa.
Well I had saved the game in Anfa (a couple of weeks ago) so I thought I might have got the quest there.
But no one I talked to mentioned oranges. (including the boy King) a case of "Listen carefully, I shall say this only once"
The quest title "who has stolen the merchants orange" had me talking to every merchant, but none mentioned oranges.
Perhaps you could leave the clues you find in the journal, instead of just saying "you have found a second clue 2/3"
and maybe who gave you the quest and what town they are from.
Not everyone can play the game in one sitting, and older blokes like me have trouble remembering when we come back to it later.
I also had a similar problem with a quest about finding a Carob plant.
The journal gave me a name, but not the town.
But I stumbled on her while looking for the orange merchant.
I didn't realize I had even found a Carob plant until I got the reply option, because it was called "Al Kharoub"
But I got to what I assume is the end of the game with only the orange quest left in my journal.
I got to the palace and he offered me his daughter for a bride.
I couldn't leave the town & there were no more quests to do, but I never got to choose a bride.
I had 212(310) approval with Hulal & only 106(189) with Dihya (who said she would be around for quickie's if I married Hulal)
Is there more to do?