While searching the internet I saw that the series and the movie is loosely (very loosely) based on the short story The Legend of Sleepy Hollow by Washington Irving. It reminds me of the stories of Henry James. The mystery hidden somewhere, but you do not always know where. The entry into other, supernatural worlds. All taking place in the countryside, close to the forest, creeks, bridges and small paths. Fog, maybe, something hidden in the unseen! I think you get my meaning.
The story is about Ichabod Crane and a Headless Horseman and how the legend came to be. Crane was a school teacher in Sleepy Hollow, which is in an area where witch-craft and superstition prevails. We follow Crane falling in love with a wealthy farmer's daughter. He is pretty sure that he will beat the other contester, Brom Bones, who is a little bit of a local bully. However, things don't go as planned and Crane leaves the party to ride home in the night. But he never reaches home, something is happening
in the woods!
Washington Irving is best known for this short story and Rip Van Winkle. He also wrote historical works including biographies of George Washington, Oliver Goldsmith and Muhammad and was interested in 15th century Spain. He served as the US Ambassador to Spain from 1842-46.