 You take your six-year-old to the playground. You watch her go down the slide, then run over to the swings. Another mother strikes up a conversation. You take your eye off your daughter for just a few seconds. You look back at the swings. And she's gone. Your heart drops into your stomach. You jump up, your eyes searching. You cry out her name. Lily? Lily? From the top of the slide, you hear a voice.