Harriet Welsch is an 11 year old who wishes to be a spy. Harriet comes from a well-off family. She doesn’t have many friends. She considers her nurse her best of friends. Every day, Harriet follows a certain routine, wherein she arrives home, eat and spy along her neighbours. She was so used to this routine when suddenly; her nurse found a lover and had decided to get married with. Because of this Harriet got mad and threw a tantrum. She lost her spy notebook which went to the hand of her classmates. Her classmates had used her spy notebook for their advantage, thus this lead to revenge by both parties.