Listen through the keyhole
From Create Your Own Story
"Vernon," Aunt Petunia says in a quivering voice, "look at the address - how could they possibly know where he sleeps? You don't think they're watching the house?"
"Watching-spying-might be following us." muttered Uncle Vernon wildly.
"But what should we do, Vernon? Should we write back? Tell them we don't want-"
"No. No, well ignore it. If they don't get an answer... yes, that's best...we won't do anything...."
"But-"
"I'm not having one in the house, Petunia! Didn't we swear when we took him in we'd stamp out that dangerous nonsense?"
Then the knob started to turn.
