In Portrait of a Killer: Jack the Ripper, Case Closed, Cornwell combines the rigorous discipline of twenty-first century police investigation with forensic techniques undreamed of during the late Victorian era to solve one of the most infamous and difficult serial murder cases in history. Drawing on unparalleled access to original Ripper evidence, documents, and records, as well as archival, academic, and law-enforcement resources, FBI profilers, and top forensic scientists, Cornwell reveals that Jack the Ripper was none other than a respected painter of his day, an artist now collected by some of the world’s finest museums: Walter Richard Sickert.

It has been said of Cornwell that no one depicts the human capability for evil better than she. Adding layer after layer of circumstantial evidence to the physical evidence discovered by modern forensic science and expert minds, Cornwell shows that Sickert, who died peacefully in his bed in 1942, at the age of 81, was not only one of Great Britain’s greatest painters but also a serial killer, a damaged diabolical man driven by megalomania and hate. She exposes Sickert as the author of the infamous Ripper letters that were written to the Metropolitan Police and the press. Her detailed analysis of his paintings shows that his art continually depicted his horrific mutilation of his victims, and her examination of this man’s birth defects, the consequent genital surgical interventions, and their effects on his upbringing present a casebook example of how a psychopathic killer is created.