Harley Quinn’s past and present have collided, and both the family she was born into and the family she found when she met Edie Malone are suffering. As Dr. Quinn’s confrontations with the serial killer she’s hunting grow more intense, his actions lead her down a dangerous path!

Dr. Harley Quinn has confronted horrific crime scenes created by a serial murderer who treats his work as high art. But when she is confronted by the killer himself, her life takes a drastic turn. Will she be able to return to the status quo, and simply help the GCPD to catch this killer? Or will the encounter change her forever?

Harley faced The Joker in her home, and now she faces him again. This time, she knows he killed her roommate. This time, she knows he’s toying with her. This time, she’s in danger of losing her reputation with the GCPD instead of her life. Their electrifying encounter will have consequences for the rest of her life-but is she ready?

In Gotham City, heinous acts of violence occur daily. Harley Quinn, forensic psychiatrist and profiler, consults with the Gotham City Police Department on its worst cases. But one unsolved murder still haunts her-the night Harley discovered her roommate’s body marked with the signature of a notorious serial killer known as The Joker. Five years later, the case remains unsolved, as a new series of horrific killings begins. When the murders escalate and the meticulously constructed crime scenes become more elaborate, Harley’s obsession with finding the depraved psychopath responsible leads her down a dangerous path. The past and the present finally collide, and Harley must decide how far she is willing to go-and how many lines she is willing to cross-to solve these cases once and for all. Written by #1 New York Times and international bestselling author Kami Garcia (Beautiful Creatures, Unbreakable, The X-Files Origins: Agent of Chaos) and drawn by Mico Suayan (Bloodshot Reborn), Jason Badower (Wonder Woman ’77), and Mike Mayhew (The Star Wars), Joker/Harley: Criminal Sanity introduces readers to a Joker and Harley Quinn unlike any they’ve seen before, utilizing forensic psychiatry, behavior analysis, and psychological profiles to create a true-to-life take on these iconic characters that is more terrifying than any psychotic fantasy. Collects Joker/Harley: Criminal Sanity #1-8 and the one-shot Joker/Harley: Criminal Sanity-Secret Files.

Ready or not, Harley Quinn is in a race against time to end The Joker’s reign of terror. Can she do it before he wreaks havoc in the Gotham Arena…and kills thousands of music fans attending the Event Horizon concert? More importantly, will she do it without ending The Joker’s life-or can she live with the consequences either way?

In Gotham City, where heinous acts of violence are a daily occurrence, the GCPD relies on Harley Quinn, a young forensic psychiatrist and profiler, to consult on their toughest cases. But Harley is haunted by one unsolved case-the night she discovered her roommate’s body marked with the signature of a notorious serial killer known as The Joker. Five years later, the case remains unsolved and a new series of horrific murders occur throughout the city. As the murders escalate, Harley’s obsession with finding the depraved psychopath responsible leads her down a dangerous path. When the past and the present finally collide, Harley has to decide how far she is willing to go-and how many lines she is willing to cross-to solve these cases once and for all. In Gotham City, where heinous acts of violence are a daily occurrence, the GCPD relies on Harley Quinn, a young forensic psychiatrist and profiler, to consult on their toughest cases. But Harley is haunted by one unsolved case-the night she discovered her roommate’s body marked with the signature of a notorious serial killer known as The Joker. Five years later, the case remains unsolved and a new series of horrific murders occur throughout the city. As the murders escalate, Harley’s obsession with finding the depraved psychopath responsible leads her down a dangerous path. When the past and the present finally collide, Harley has to decide how far she is willing to go-and how many lines she is willing to cross-to solve these cases once and for all.

Jim Gordon and the GCPD have turned to profiler Harley Quinn for assistance. She's intrigued by the level of care and detail this new, depraved serial killer is putting into his crime scenes; there must be clues to his pathology in his artful staging. His level of meticulous preparation is unusual, but will it lead to or help delay his capture?