The Joker is dead, Bruce Wayne is behind bars...and Gotham City is just starting to redefine itself without Batman. As Harley Quinn struggles to adjust to her new life as the mother of Jack Napier's twins, an elusive mastermind called the Producer seizes the moment to assemble a crew of villains-starting with the Starlet, a serial killer who murders Gotham's golden age film stars in homage to their silver screen roles. When a recent, gruesome crime scene suggests a connection to The Joker, the GTO, and FBI agent Hector Quimby turn to Harley as the one person with information that could crack the case. With some help from Bruce, Harley agrees to investigate-but to protect her children and her city from a fatal final act, Harley must flirt with madness and confront her own past.

Gotham City’s elusive serial killer, the Starlet, and her mysterious benefactor reach the pinnacle of their power, terrorizing the city and teasing the GCPD with strange clues and a famous new victim. Harley goes rogue and hunts down a shocking major lead in the case, but her ruthless style backfires and she puts herself at the mercy of Commissioner Montoya for a shot at redemption. When FBI Agent Hector Quimby becomes an ally in a crucial moment, he and Harley forge a partnership that will soon take them down a familiar and ominous road.

Harley and the GTO seize an opportunity to investigate the Starlet’s failed murder attempt. When the survivor offers a startling revelation about Agent Hector Quimby, the team acts quickly on the intel (and a handful of colorful clues) to interrogate an inconvenient new suspect. Harley’s fears are realized when she makes a chilling discovery that reminds her of The Joker’s worst obsessive behaviors-a development that casts light on new suspicions and conflicts of interest, and threatens to compromise the whole case.

Harley’s pursuit of the Golden Age killer gets personal. Still in the fog of her discovery about Hector’s obsession, she relives her darkest memory of Jack’s transformation into The Joker-and her own early evolution into Harley Quinn. With Bruce’s counsel, she grapples with the guilt of her past and makes a choice that sends her straight into Starlet and the Producer’s den for an expertly staged showdown that will either crack the case or end her life.

The Producer’s scheme is in motion, and the GTO is on high alert as Gotham’s hope of a peaceful new horizon begins to collapse. Rattled and recovering from a close encounter with Starlet, Harley examines whether her complicated past with villainy is a burden or a boon to her new identity. She weighs two final options: break all ties and retire to a quiet life, or embrace the chaos, risk, and responsibility of protecting the people and the place that created her. The choice itself may be fantasy, as a targeted attack on Harley ends in tragedy and drives Bruce to a reckless decision that could extend his prison sentence indefinitely.

Gotham City’s fate hangs in the balance in this conclusion to Harley Quinn’s quest to catch a serial killer! Harley knew the risks when she agreed to help the GTO capture Gotham’s most savage new criminals, and all her fears have come to pass. Her pursuit of Starlet and the Producer has magnified the overwhelming responsibilities of motherhood, endangered her life and loved ones, and forced her to revisit the most painful memories of her own criminal past. Now, on the eve of Starlet’s final spectacular act at the Gotham Film Festival, the case has become personal. As Harley grieves a shocking personal loss, she prepares to risk everything to prove she can deliver on her commitments and bring the case to a close. With one final assist from Bruce, Harley heads to center stage for a showdown that will make or break Gotham’s future-and determine Harley’s role within it.

The Joker is dead. Batman is behind bars. In a new age of villains, only Harley can save Gotham. Two years after Azrael wiped out Gotham's deadliest villains in Curse of the White Knight, the stage is set for a new criminal uprising. From the shadows, a visionary mastermind known as the Producer is assembling a colorful roster of new rogues—headlined by his alluring recruit Starlet, an actor turned serial killer with a vendetta against Gotham's Golden Age film stars. When Starlet's grisly crime scenes hint at an impossible link to the Joker, the GCPD—aided by eager young FBI agent Hector Quimby—turns to Harley Quinn to crack the case. But Harley is struggling to navigate her new role as a single mother to the late Jack Napier's twins, and revisiting Gotham's underworld—even as a "good guy"—will force her to fight her own worst instincts and flirt with danger. Determined to prove she can balance it all, Harley accepts Bruce Wayne's guidance and inches closer to the killer—and when the Producer's twisted script comes into full focus, she must confront her past to protect her children and Gotham from a fatal final act. Novelist Katan Collins and artist Matteo Scalera team up for White Knight Harley Quinn—a thrilling standalone addition to Sean Murphy's White Knight universe, expanding on the events of White Knight and Curse of the White Knight . This volume collects all six issues of the original series as well as an in-world bonus story originally published as part of the hit digital series Harley Quinn Black + White + Red .