It took no time for her project to stall, which wasn't surprising, Charms had always been her weakest subject.
Luckily, she knew a Charm's Master.
"...and why don't they make the homeowners the secret-keeper?"
"The caster pulls the location from the protectee's mind then hides it in the keeper's magic. If the keeper provides the information, it will slip back into their mind not their magic."
"But!" Bill did it.
"I suppose it could work. If the caster was also the homeowner. As they know their own magic, intimately."
She deflated.
"...thank you, Professor."