Eventually she spoke: "We've got to delete that footage and get rid of that camera. This is not okay. They're our guests. And our friends. Can you imagine if they ever learned what happened?"

"I know." I responded, sheepishly. "Look, I'm not sure how to delete footage in the app, but the good news is that all of the footage is automatically deleted after 48 hours. It will all be gone before they're even back from Maya's parents."

That seemed to give Emily some comfort, but she still had a look of shock on her face as she got up and wandered upstairs, clearly still reeling from the news. I...