Story of a Whim, The by Grace Livingston Hill (1865 - 1947)

A group of girls send gifts and letters to one whom they think to be a young woman like them. "Christie" is really a poor young bachelor tending his orange grove in sunny Florida. Through his correspondence with Hazel (who still thinks he's a girl) he becomes a Christian, and falls in love with her. What will happen when she takes a trip south to meet her dear pen-pal? - Summary by LikeManyWaters