As the cinematic experience unfolds, we find ourselves immersed in the vibrant atmosphere of a street festival, where Detective Marv Boswick’s day tragically takes a turn for the worse. A cunning thief manages to snatch away his belongings, prompting Boswick to chase him through the twisting streets, eventually leading into the depths of the city’s sewer system. This gripping pursuit culminates in a brutal showdown, leaving Boswick unconscious on the cold, damp ground beneath him.
Upon regaining consciousness, Boswick discovers himself precariously situated on a stool, bound by razor wire, his tongue ensnared in a gruesome device. A television screen ominously flickers to life, revealing a bone-chilling video message from an unknown sender, eerily echoing the notorious Jigsaw killer. The message delivers a haunting indictment, condemning Boswick for utilizing his tongue to mislead and harm the innocent in court, now forcing him into a horrific predicament: either tear out his own tongue or be "railroaded" by an approaching subway train.
As the fateful moments play out, Boswick's desperate struggles prove in vain as the train barrels toward him, extinguishing not just his hopes but also his very existence. The scene dramatically transitions to Zeke Banks, an undercover officer immersed in a chaotic robbery attempt gone awry. With escaping under duress from law enforcement, it becomes apparent that Banks’ cover has been compromised, leading him to return to his previous role as a detective. Assigned a rookie partner, William Schenk, by Captain Angie Garza, Banks faces the challenge of adapting to the hostile dynamics within the precinct, particularly due to the resentment stemming from his past actions against a corrupt officer.
As the investigation into the subway's horrifying discovery unfolds, Banks and Schenk remain oblivious to the chilling connection to Boswick's gruesome demise. Their unlikely partnership faces tests of loyalty and integrity amidst a tangled web of deceit, corruption, and the very essence of justice. A cryptic package arrives for Banks, containing a USB drive with a sinister message from this new incarnation of Jigsaw, alongside a pig marionette donned in police attire. The message is a revelation of a perverse mission: to reform the police department through a series of gruesome murders, culminating in a distressing symbol of a spiral inscribed on the courthouse wall – an omen of the impending chaos.
Following this distressing revelation, the police department is thrown into turmoil, leading to a grim discovery at the courthouse: Boswick's tongue and badge, signaling the killer's direct targeting of the force. In the midst of personal loss, Banks pays a solemn visit to Boswick’s grieving widow, all while navigating a turbulent argument with his ex-wife at the funeral.
As the narrative unfolds, flashbacks reveal the profound complexities of Banks’ history, including the pivotal moment when he bravely testified against corrupt officer Pete, fostering a fraught legacy that haunts his relationship with his estranged father, Marcus. Meanwhile, Detectives Kraus and Fitch tirelessly pursue the lead on Boswick’s final chase, only to discover they’ve been outmaneuvered by an adversary lurking in the shadows.
The tension intensifies as Banks seeks guidance from Marcus, only to find him missing. A flashback unveils Marcus' disapproval of Banks' courageous decision regarding Pete, illuminating the deep-seated resentments that linger between them. The ritualistic horror of the Jigsaw killer continues, plunging the precinct into a downward spiral of violence and manipulation that has them grappling with their ideals of justice.
As the investigation unearths more gruesome evidence, the police converge on a stark reality — their colleague Fitch finds himself ensnared in the killer's merciless game, forced to face the consequences of his own dark past. Meanwhile, the stakes rise as Schenk becomes further embroiled in the unfolding chaos, ultimately leading Banks to confront moral dilemmas that challenge the very fabric of his belief system.
In the chaos, he uncovers the horrific truth about his newest partner, Schenk, revealing him as the orchestrator of this tormenting game, whose vendetta runs deep against the corrupt law enforcement system. Schenk unveils a well-crafted plan for justice twisted by personal vengeance, ultimately leading Banks into a harrowing experience as he grapples with the ramifications of his actions.
With the race against time peaking, Schenk presents Banks with a heart-wrenching choice between saving his father or putting an end to the madness. As the police arrive, a tragic confrontation ensues, leading to an emotional climax that tests Banks's convictions and brings forth haunting consequences of betrayal, revenge, and ultimately the relentless pursuit of justice in a corrupt world.
