Lala, was the Royal Nanny for the children of Queen May and King George V. There were six children but she was hired to work with the last three from infancy. She was a true royal servant keeping their secrets and those of many others. Lala was like many of the staff of that period, more involved in rearing the children and keeping the household than the monarchs, themselves. At various points in the book, she is given positions that would only have been allocated to someone of trust. Like many others in service, she gave up her own personal life to serve the family.
Harper wrote a factional book - meaning that it was fiction for the dialogue but fact for most of the story. Good read - never knew some of the facts about one of the children.