Belondor has agreed to a clandestine meeting with the Order of the Eagle and has asked you to accompany him.
'${PLAYER}, I would like you to come with me to this meeting. I don't truly think Prince Imrahil has evil intentions, but in my heart, I don't think I will ever be able to forget that the Steward of Gondor, whom I served faithfully, ordered my death and sent a man I loved like a brother to do it. The experience has made me cautious, to say the least.
'If you will accompany me, we should travel separately to not arouse suspicion. I am to meet this Tabrím fellow in Umbar-môkh at a place in Tâkhdar; the Cellars, east of Tilmakhím. Meet us there.'
Travelling separately, Belondor has asked you to meet Tabrím and himself in Umbar-môkh at a place in Tâkhdar; the Cellars, east of Tilmakhím.
You have arrived in Umbar-môkh, where you are to join Belondor in meeting with Tabrím. You should talk to Belondor.
You have arrived in Umbar-môkh, where you have joined Belondor and Tabrím. You should see what Tabrím has to say.
Tabrím has revealed that the Order of the Eagle knows that Azagath and Nakási were preparing to travel by land, not by sea. He put forth the Order's theory that the two went to Mâkhda Khorbo to retrieve something. Identifying what that was should help reveal their destination. You should talk to Belondor.