Ellen Gleeson was unlocking her front door when something in the mail caught her attention. It was a white card with photos of missing children, and one of the little boys looked oddly like her son. She eyed the photo as she twisted her key in the lock, but the mechanism was jammed, probably because of the cold. Snow encrusted SUVs and swingsets, and the night sky was the color of frozen blueberries.

Ellen couldn't stop looking at the white card, which read HAVE YOU SEEN THIS CHILD? The resemblance between the boy in the photo and her son was uncanny. They had the same wide-set eyes, smallish nose, and lopsided grin. Maybe it was the lighting on the porch. Her fixture had one of those bulbs that was supposed to repel bugs but only colored them yellow. She held the photo closer, but came to the same conclusion. The boys could have been twins.

Weird, Ellen thought. Her son didn't have a twin. She had adopted him as an only child.