Dorothy Arnold left her family’s house in New York on December 12, 1910. She told her mother she was going shopping for a dress for her sister’s debutante party.

She was 25, came from a very wealthy family, and had been trying to become a writer. That morning she bought a box of chocolates, walked to Brentano’s bookstore, bought a book, and ran into her friend Gladys King outside.

They talked for a few minutes. Dorothy said she was going to walk through Central Park and meet her mother for lunch at the Waldorf.

She never showed up.

What makes the case strange is how little there is after that. No confirmed sighting. No body. No luggage packed for a trip. No note saying she planned to leave. Her family even kept the disappearance quiet for weeks before finally going public.

There was also a secret relationship with George Griscom, a man her parents strongly disliked. They had secretly traveled together and exchanged letters. Later theories suggested everything from an accidental death to foul play, but none has ever been proven.

Her family spent a fortune looking for her.

115 years later, nobody can say with any certainty what happened after Dorothy walked away from that bookstore.

The Strange Disappearance of Dorothy Arnold: In 1910, She Left Her Family’s Mansion to Buy a Dress, Met a Friend Outside a Bookstore, Made Plans for Lunch, and Then Vanished Without Leaving a Single Confirmed Trace Behind.