In Nancy Drew: Treasure in the Royal Tower, you are determined to locate and get to the off-limits library. After you have discovered the elevator shaft, take the elevator to the basement, and climb out of the elevator into the shaft. Climb the rungs on the wall until you see an open air duct. Crawl through the air duct to the very end, open the grate, and step into the library. You suddenly here someone coming in, so quickly turn around, and crawl back into the duct to spy.
