My friend told me about something that happened to her when she was younger, about 8 or 9. She was walking home from school and got her key out to let herself in to the house. Her single mum worked and came home later on weekdays. As she reached up to put her key in the door her mum opened it, in dressing gown having left home sick. Instead of greeting her, she looked straight past my friend and immediately said “who are you?” My friend turned around and a man in a long coat hurried back down the path and down the street. Being ill that day had potentially saved her daughter from something potentially horrible happening to her.