“I mean, there are thumps and bangs nearly every night but things get really crazy every three weeks or so.” She tapped her finger on her chin. “What is going on every three weeks to ramp activity up so much?”

Before I could formulate a hypothesis, something caught my eye. The wall above my desk was moving, almost breathing. As I watched, I could see a spot bow out and back flat, out and back until I wasn’t sure if my eyes were playing tricks on me.

Angie was still thumbing through her notebook, trying to figure out what the pattern could mean so she didn’t notice when I climbed off the bed. My curiosity overwhelmed my fear and I advanced on the wall, walking on tiptoes until I could reach o...

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