You've probably heard stories about creatures that try to gain entry because they can't get in without permission. They're usually described as strange and impatient beings who, for some reason, ask permission to enter places where ordinary people can enter without any fuss (and some people, even a locked door won't stop them).
But what if they act more discreetly?
What if they don't appear in the middle of the night with a strange request, for a stranger, to "let me in!"?
What if they start their activities during the day?
For example, while heading out for a break, you notice a stranger approaching you with a seemingly mundane question:
"Is your boss there?"
He's got an interview scheduled today... He's been waiting here for half an hour already... Could you remind your boss...
And of course you will! What's it cost you? But you're just one element in this scheme...