We just got fresh snow last night. Today I went out to the store and I just got home, and noticed two sets of footprints all the way around my house. If it was just one set, I wouldn't have thought anything of it. It's around the time of month the electric company reads the meter. But he usually stops in the road and walks straight in and out, he doesn't walk the entire perimeter of the house. Plus, the footprints didn't stop at the utility access area.
With the recent history of my doorbell ringing at 1am and banging outside near the garage after midnight, I'm even more suspicious.