Joanne Barrow, nanny extaordinaire, was looking after three girls, ages 10-12, on vacation with their well-off family in Aspen. During a big party at the family’s mountain home, Barrow went to check on the girls and the three little friends they had brought on the trip. To Barrow’s shock, the girls’ room was empty. They had tied a rope around the balcony railing and shimmied down into the snow. She dashed outside and followed the footprints until she found her charges less than a quarter mile from the house, chilly but safe. She says that was the most harrowing experience of her 22 years working as a nanny, and a rare black mark on her pristine record.