Harriet M. Welsch is a fictional character from the beloved children's book series, "Harriet the Spy," written by Louise Fitzhugh. Harriet is an eleven-year-old girl who aspires to be a writer and spends her time observing the people around her, taking notes in her secret notebook. Her keen observations and candid nature lead her to discover the complexities of friendships and the challenges of growing up. Set in New York City, Harriet's adventures highlight themes of identity, creativity, and the importance of honesty. The story explores her journey as she navigates the consequences of her spying and learns valuable lessons about trust and empathy.