Between the events of 'Saw' and 'Saw II', a sick and desperate John Kramer travels to Mexico for a risky and experimental medical procedure in hopes of a miracle cure for his cancer, only to discover the entire operation is a scam to defraud the most vulnerable. Armed with a newfound purpose, the infamous serial killer returns to his work, turning the tables on the con artists in his signature visceral way through devious, deranged, and ingenious traps.
Sofia, an insecure young woman, begins babysitting two troublesome siblings that turn her job into a complete living hell. That is until a devilish presence starts messing with the trio and they must band together to fight the demon away.