Scarlet Letter-Secret Theme One of the main themes in The Scarlet Letter is that of the secret. The plot of the book is centered around Hester Prynne’s secret sin of adultery. Nathaniel Hawthorne draws striking parallelism between secrets held and the physical and mental states of those who hold them. The Scarlet Letter demonstrates that a secret or feeling kept within slowly engulfs and destroys the soul, while a secret made public can allow a soul to recover and even strengthen. When a secret is hidden inside it can engulf and even destroy a person. Arthur Dimmesdale, a revered young