The film is based on a true crime and adapted from the best-selling novel of the same name. The victim, Elizabeth Short, was born on July 29, 1924. During World War II, many actresses dreamed of becoming famous in Hollywood, and Short was no exception. She went to Los Angeles alone at the age of 19. But Elizabeth's road to realizing her dream was not smooth. She often appeared in celebrity social venues, trying to exchange her body for money or performance opportunities. It is said that Elizabeth also met a male friend at the Biltmore Hotel on Grand Avenue on January 9, 1947. That was the last time she appeared in public. Elizabeth had black hair, liked black clothes, and often wore beautiful flowers on her hair. In addition, the then blonde actress Veronica Lake starred in "The Blue Dahlia" (also translated as: Blood Splattered Xuan). Palace) had just been released, so The Black Dahlia became her nickname during and after her death.

The shocking murder of a young actress shocked Hollywood and the United States in 1947. Los Angeles, the center of the entertainment industry, was full of gangsters, sleazy film company executives, corrupt police officers, etc. Everyone wanted to take advantage of young people. The woman's advantage... and everyone wants to get a piece of the story of her tragic death. For several months after the incident, Elizabeth's story was used as the headline in both major newspapers and tabloids, from "Who Killed Elizabeth Short?" ” to “Black Bags, Black Shoes: The Sexy Dahlia Leads the Way” and other titles, Elizabeth became a Hollywood legend after her death. Everyone involved in the investigation dives headfirst into either trying to ruin Dahlia's reputation or trying to save it. After Elizabeth was killed, various messages, accusations, and confessions were circulated, but the murderer was never caught, and this became an unsolved case of the Los Angeles Major Crime Unit. Forty years after Elizabeth was murdered, crime novelist James Aloy wrote the book "The Black Dahlia". This crime mystery novel immediately became a best-seller after it came out. Later, James successively released "The Big Nowhere", "L.A. Confidential" (L.A. Confidential) and "White Jazz" are three style works, thus completing the creation of the so-called "L.A. Quadrilogy".