I was typing an email, so I spun away from my computer to look at my office phone, and THE LIGHT WAS ON AT THE FRONT DESK.
It was my "WE'VE TRACED THE CALL; IT'S COMING FROM INSIDE THE HOUSE" moment.
I fought the urge to cower under my desk (that would have worked - the light on in my office, Taylor Swift on the computer radio, my coffee cup steaming...), grabbed my scissors from my "World's Best Boss" coffee cup/pen holder, and stealthily jogged down the hall to the front desk ("don't run with scissors" loses a little of its sensibleness when you're about to defend your life).
Of course no one was up there. I realize now that when someone calls on the weekend and the phone is on night ring, it gives anyone in the office a courtesy beep to let them know the phone is ringing. The general voicemail just runs through the front desk line. There was no one at the front desk, playing a little cat and mouse preparing to murder me.
OR WAS THERE?
I just realized...I didn't check the bathroom...