For a moment, Derek looks confused. The hell does magic have to do with anything? And besides, yes, yes it is like magic and that's probably why he has so much trouble with it, thank you very much. The first two series don't ring bells — he's heard of both but read neither — but Lord of the Rings has his attention. And when she finishes with that analogy, it makes more sense.

Although for Derek, home security is his claws and fangs.

"No, no," Derek says, shaking his head when she laughs and seems to be implying an apology for sounding like she's one thing when she's actually another. "No, it doesn't—it didn't sound like that. I follow," he promises. "So how do you look for weaknesses with technology? There aren't any doors, windows, cellars, or traitorous back fences in the Internet, after all, right?"