In 1862, a young Englishwoman becomes royal tutor in Siam and befriends the King.

Charlotte 'Charlie' Newton is bored with her quiet life at home with her parents and her younger sister. She wishes something exciting would happen and knows exactly what they need: a visit from her sophisticated and much traveled uncle Charlie Oakley, her mother's younger brother. Imagine her delight when, out of the blue, they receive a telegram from uncle Charlie announcing that he is coming to visit them for awhile. Charlie Oakley creates quite a stir and charms the ladies club as well as the bank president where his brother-in-law works. Young Charlie begins to notice some odd behavior on his part, such as cutting out a story in the local paper about a man who marries and then murders rich widows. When two strangers appear asking questions about him, she begins to imagine the worse about her dearly beloved uncle Charlie.