In January 1947, the body of Elizabeth Short, completely drained of blood, was discovered in an undeveloped lot in Los Angeles. Its gruesome mutilations led to a firestorm of publicity, city-wide panic, and an unprecedented number of investigative paths led by the LAPD--all dead ends. The Black Dahlia murder remained an unsolved mystery for over seventy years. Six years earlier and sixteen hundred miles away, another woman's life ended in a similarly horrific manner. Leila Welsh was an ambitious, educated, popular, and socially connected beauty. Though raised modestly on a prairie farm, she was heiress to her Kansas City family's status and wealth. On a winter morning in 1941, Leila's butchered body was found in her bedroom bearing the marks of unspeakable trauma. One victim faded into obscurity. The other became notorious. Both had in common a killer whose sadistic mind was a labyrinth of dark secrets. Eli Frankel reveals a key fact about the Black Dahlia crime scene that leads inexorably to the stunning identification of a criminal who was at the same time amateurish and fiendish, skilled and lucky, sophisticated and brutish. Drawing on documents, law enforcement files, interviews, the victims' own letters, trial transcripts, military records, and more, this true-crime saga puts together the missing pieces of a legendary puzzle.