Spiral: From the Book of Saw

Detective Marv Boswick participates in a lively Fourth of July parade when a thief unexpectedly slips into a sewer drainage pipe. Determined to catch the thief, Boswick embarks on a perilous chase that quickly escalates into a dangerous situation.

During his pursuit, Boswick is suddenly ambushed by a masked figure wearing a pig mask. This shocking attack leaves him unconscious, only to awaken in a subway tunnel in a grisly predicament.

Suspended in the subway tunnel, Boswick is confronted with a harrowing choice through a recorded message: tear out his tongue or remain, facing a deadly train. This horrifying ultimatum reveals the depths of his dire situation.

Unfortunately, Boswick cannot make his choice in time and is tragically killed by an oncoming train. His death sets off a chain reaction of investigations into the circumstances surrounding this horrific event.

The following day, Captain Angie Garza assigns the investigation of Boswick's death to Detective Ezekiel Banks and his rookie partner, William Schenk. As they begin their inquiry, they realize the case bears chilling similarities to the infamous Jigsaw Killer's modus operandi.

In a parallel storyline, Detective Fitch, who had previously ignored a distress call from Banks, becomes the next victim of a gruesome trap where he must choose between self-mutilation or being electrocuted. The situation escalates quickly, leading to Fitch's untimely demise.

As the investigation progresses, some officers begin to suspect Banks may be involved in the cases due to his contentious history with Fitch. This growing suspicion casts a shadow over Banks and Schenk as they try to clear their names.

A mysterious box arrives at the precinct containing a sinister pig puppet and a piece of skin with Schenk's tattoo. This unsettling clue directs Banks' team to a former butcher shop from Banks' childhood, tying personal history to their investigation.

At the butcher shop, Banks and his team discover a tape recorder and a skinned corpse identified as Schenk. This grim revelation deepens their desperation to uncover the killer's identity and the motives behind these brutal acts.

As the investigation intensifies, Banks' father, Marcus, is abducted while searching for clues. This personal connection heightens the stakes for Banks as the lives of those he loves hang in the balance.

Captain Garza faces her own nightmare when she finds herself trapped in the precinct's cold storage, forced to sever her spinal cord to stop hot wax from burning her face. Despite her efforts to escape, the subsequent injuries are fatal.

Captured and restrained in a warehouse, Banks contemplates an extreme act to free himself. Instead of sawing off his arm with a hacksaw, he cleverly unlocks his cuffs with a bobby pin, allowing him to continue his search for answers.

While navigating the warehouse, Banks encounters Pete, his former partner dismissed after a murder scandal. Together, they face a deadly mechanism that tests their resolve as a tape recording presents an impossible choice.

In a shocking turn of events, Banks discovers that Schenk is alive and has faked his death using a corpse. Schenk, now revealing himself as Emerson, exposes the twisted motivations behind the murders and aims to draw Banks into his vengeful scheme.

Emerson presents Banks with a final, devastating choice involving his father. With a gun in hand and the fate of Marcus hanging in the balance, Banks is forced into a morally complex decision that will haunt him forever.