When an upstairs light came on and a shadow moved past a window, I held my breath for a moment.

A minute later, one of the upstairs lights went off also.

I spent an hour gazing at the remaining upstairs light.

"It works on the upstairs lights, not these down here."

While he was pondering upon some plan, the upstairs lights went out.

A long fifteen minutes later, the upstairs lights winked out as well.

After a couple of minutes the upstairs light started down, headed for the others.

After turning off the upstairs lights, he went down to the kitchen.

The silent figure came into view, being beneath an upstairs light.

The upstairs lights were on now, but there was still no movement inside.