Joker/Harley: Criminal Sanity | HardcoverMurder is his art. Catching killers is hers. In Gotham City, heinous acts of violence are a daily occurrence. Harley Quinn, forensic psychiatrist and profiler, consults with the GCPD ontheir worst cases. But she is fixated on an unsolved murder that haunts herthe night she discovered her roommates body marked with thesignature of a notorious serial killer known as The Joker. Five years later, the case remains unsolved, and a new series of horrific