All the passengers plus the copilot had zipped off the delayed plane, with their luggage bouncing behind them, when Kylie, the flight attendant, and Landon, the pilot, heard a whimpering cry that drew them to seat 21D, where a tiny, blue-eyed, golden-curled girl huddled, awaiting her mother's return. But the mother had designs of her own, unbeknownst to the shocked trio left in her wake. As the innocent toddler grew increasingly central to their happiness,...