Escalating

There was a dark figure pacing back and forth, muttering viciously under his breath. That’s when Joe realized — with a sinking feeling of absolute terror — that he had been watched the entire time. He grabbed his pepper spray. But when he looked again, the figure had gone. But the next morning, he found that his mug had been emptied and a note had been rolled into it with three words crudely scrawled: “Let Us In.” But things were about to get stranger.