The Doppelgänger Omen

You are just a simple doorman (as far as anyone else is concerned.) You probably don't stick out in (most) of the residences' minds, but that's exactly how you want it, right? It makes sure the you don't get distracted from your job, one that you're suspiciously good at. Only you and the 'physicist,' Dr. W Afton know why. However, the secret to your success gets harder and harder to keep, as the other residents notice strange things. The alarm is blaring constantly, as if the building is the doppelgängers' main target. What do these creatures want with the building? Are they after someone in particular? With the monsters relentlessness, how could they be sure that one hasn't made it inside?

"... Where did you say you grew up again?"