Paula watched the screen, her face lit by the pale blue light of the display.

Then Paula stopped moving the probe.

She reached out with her thumb and turned a small dial on the base of the machine, zooming in on a dense, dark oval near the bottom left corner of the screen.

Her shoulders went rigid.

“Is something wrong?” I asked, stepping closer to the side of the table.

Paula didn’t look up from the display.

She pressed a yellow freeze button on the keyboard, locking the image of the dark shape on the screen, and reached across the console for the wall phone.