Dorothy Harriet Camille Arnold (July 1, 1885 – disappeared December 12, 1910) was an American socialite and heiress who disappeared under mysterious circumstances in New York City in December 1910. The daughter of Francis R. Arnold, a fine goods importer, Arnold was born and raised in Manhattan in an affluent family. After graduating from Bryn Mawr College, she returned to her family home at 108 East 79th Street and attempted to begin a career as a writer. On December 12, 1910, Arnold left her home to go shopping for a dress and was seen by a cashier as well as a friend on Fifth Avenue. She told the friend that she had planned to walk through Central Park before returning home. That evening, when Arnold failed to return home for dinner, her family grew suspicious. Francis Arnold at first wanted to avoid publicity over his daughter's disappearance, and so he initially sought the help of private investigators in locating her. After these attempts proved fruitless, the family filed a missing persons report with the New York City Police Department (NYPD) in January 1911. Various theories, sightings, and rumors regarding Arnold's disappearance circulated in the years and decades after she was last seen, but the circumstances surrounding her disappearance have never been resolved and her fate remains unknown. Timeline Background Dorothy Harriet Camille Arnold was born in New York City, the second of four children of perfume importer Francis Rose Arnold and his wife Mary Martha Parks Arnold (née Samuels). She had an older brother, John (born December 1884) and two younger siblings: Dan Hinckley (born February 1888) and Marjorie Brewster (born August 1891). Arnold's father was a Harvard University graduate who was a senior partner of F.R. Arnold & Co., a company that imported "fancy goods." His sister, Harriette Maria Arnold, was married to Supreme Court Justice Rufus W. Peckham. Dorothy Arnold's paternal family were descendants of English passengers who arrived in America on the Mayflower, while her mother hailed from Montreal, Quebec, Canada. Due to their social standing, the family was listed in the Social Register. Arnold was educated at the Veltin School for Girls in New York City and attended Bryn Mawr College in Pennsylvania, where she majored in literature and language. She graduated in 1905. After her graduation, Arnold continued to live at the family home at 108 East 79th Street and attempted to begin a career