Rift Quest:Bahralt's Shrine  

When you finally find the Shrine, click it. This will do nothing except tell you that you need the key. Now step back and wait a second for the keyholder to appear. Kill her and then reconsecrate the Shrine.

Now, you will see a quest-giver on your minimap in the next room. Don't forget to go pick up Carwin's Journal, the starter for Lost Lore.