Margaret Peregrine is a high school sophomore. Most of the time, she's either at school, at the school robotics club, at the school chess club, or doing schoolwork. Today, she's cleaning out her late great-grandmother's attic.
"I don't think I've checked that yet, actually." She drops the rock in her pocket and tries it.
"Okay, pocket is no good, it might actually have to be in my hand in particular . . ." She tries with it stuffed down her sock, touching her ankle.
"Looks like I specifically have to be holding it, which makes sense given the way I designed it. So having the keywords in French was probably an excess of caution." She shrugs, fishes the rock back out of her sock and holds it out. "Want to try it?"
"Cool. And that one's just a proof of concept, I can make you a custom one with whatever keywords you want to use. I'm planning to do it on rings or necklaces and sell them over the internet."
"That's the plan, yeah, getting rich. And I'm probably going to have to get cheap ones for the first few, because I don't have much starting capital, but I bet I'll be able to charge more if I have nicer pieces, so I'll want to buy some of your stuff once I can afford it."
"I don't really want to go into the high-end jewelry business though, if I buy some really fancy thing and nobody wants that specific thing as an invisibility item I'm out the money . . . I might want to offer custom orders, do you take commissions? Or know how to find someone who does?"
"Cool! I need to, like, make a webpage now, I guess. I have no clue how to run a business."
"Maybe you can do it and show me how? And then I'll know if I ever want to redo it or something."
"How much money? I should make sure I have a month or two of hosting saved up in advance."