"Not yet. For all you know Stacy will decide that she doesn't like people listening to her walls and decide to eat you," Merlin said. "And for your information, I've actually had a lot of practice of listening through walls, and that one is definitely too thick to hear anything from the next room."

Well, if you were listening for something in the next room. The idea that someone might actually want to listen to the walls themselves was not something that had occurred to Merlin.

"Who are you, anyway?" Merlin said. This was the second time he'd met the man, and Merlin was still completely baffled.