I'm stuck on a thieves guild quest, Lost Histories. When I go look for the Pale Lady and Amusei, they're not there, just the dead guy. I've tried waiting, I've tried sleeping, I've tried NOT breaking in and using that job to get into the prison.. Nothing! I have found the secret passage and the secret room, and I can activate the dead body to get a quest update, which states Amusei and the Pale Lady should be right there, but they're not.

One time the Pale Lady was in the secret room, but Amusei wasn't, so that wasn't of much use to me either. This hasn't happened again, just once.

Please help me, I'm really stumped on how to go on.