Another theme might be the idea of family dynamics. The presence of a nanny can significantly impact how a family functions, so that could be explored in the book. Also, the true - story aspect might add an extra layer of authenticity to these themes. For example, real - life events could have influenced how the family interacted with the nanny and vice versa. The book may also touch on the theme of class differences, as the role of a nanny often involves different social and economic strata.
Indeed, 'The Perfect Nanny' is based on a real story. Such a basis allows the story to touch on some very real and raw emotions. It can show how families can become overly reliant on a nanny, and how the nanny herself might develop deep - seated feelings towards the family. It's a story that reflects real - life family dynamics and the role that a nanny can play within that, whether positive or negative.
I'm not sure of specific reviews offhand. You could try looking on Goodreads. There are usually a lot of reader reviews there that can give you an idea of what people thought about the book.
The main characters are likely the nanny herself. And of course, the family members she is taking care of, which probably include the parents and the children.
The main plot likely revolves around the experiences with the so - called 'perfect nanny'. It might involve how she was initially perceived as ideal in taking care of the children, perhaps with great skills in handling daily tasks, feeding, and putting the kids to sleep. But there could be a twist as in many such stories, like maybe she has some hidden motives or secrets that gradually come to light.