When Dorothy Arnold disappeared on December 12, 1910, it was a huge deal. She was from an ultra-wealthy family that proudly went all the way back to the nation's founding, included members of the U.S. Supreme Court, and was on the who's-who list of New York City's elite. All that made the daytime, downtown disappearance of the studious 25-year-old heiress that much weirder.

According to American Heritage, Arnold left her house at 11 am, heading out into the streets of New York City. She went to Brentano's bookstore, then met up with a friend named Gladys King. They chatted, and then, Arnold seemingly disappeared. Strangely, the finality of her disappearance may have had something to do with the reaction of her family, which was to cover the whole thing up. Instead of calling law enforcement, they called a lawyer, who visited hospitals, morgues, and jails looking for her. He had no luck, and after six weeks, the family finally called in the Pinkertons.

Tantalizing clues were uncovered: Dorothy Arnold, it seemed, had led something of a life that her parents had been unaware of. They found she had been spending time in Boston with a 42-year-old man named George C. Griscom Jr., but ultimately, her disappearance wasn't linked to him at all. It wasn't linked to anyone, in fact, and she had completely and thoroughly vanished. Reports of sightings of her were given to law enforcement pretty regularly for decades, but exactly what happened to her remains a mystery.

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