Set in the bleak, soot-stained underbelly of Victorian London, the dark tale follows Benjamin Barker, a wrongfully exiled barber. Fifteen years prior, the corrupt and lustful Judge Turpin coveted Barker’s
beautiful wife, Lucy, and orchestrated a sham trial to banish Barker to the colonies. Returning under the alias Sweeney Todd, Barker seeks absolute vengeance. He discovers his old boarding house above a struggling meat pie shop run by the pragmatic, eccentric Mrs. Nellie Lovett. Lovett reveals that Lucy poisoned herself after being assaulted by Turpin, who subsequently took in their infant daughter, Johanna, as his ward.Consumed by grief and a murderous rage, Todd reclaims his polished silver straight razors and reopens his tonsorial parlor. His primary motivation is assassinating Turpin and his sycophantic cohort, Beadle Bamford. Meanwhile, a naive sailor named Anthony Hope rescues Johanna from Turpin’s clutches, instantly
falling in love with her and vowing to free her from her forced guardian's grasp.Todd’s plans accelerate when Signor Pirelli, a fraudulent rival barber, recognizes Todd from his past and attempts blackmail. To protect his secret, Todd slits Pirelli’s throat, committing his first cold-blooded murder. Mrs. Lovett, desperate for business and deeply infatuated with Todd, devises a brilliantly macabre solution to dispose of the mounting corpses: she bakes the human remains into her meat pies. The gruesome scheme transforms her failing bakery into the most popular, bustling establishment in London, while Todd continues his relentless, rooftop vigil awaiting Turpin's return.The plot thickens when Anthony brings a deranged beggar woman to the shop, whom Todd dismisses as a nuisance. Turpin, sensing Johanna’s rebellious affection for Anthony, decides to hastily marry his ward himself. Lured by the promise of delivering Turpin to his shop, Todd orchestrates a final confrontation. When Turpin finally arrives, Todd prepares to execute him, but the romantic interruption of young Anthony causes Turpin to panic and flee, temporarily denying Todd his ultimate satisfaction.Driven mad by a relentless desire for blood, Todd begins slashing the throats of innocent customers indiscriminately. In the catastrophic climax, Turpin returns, and Todd finally slaughters the corrupt judge. However, during the struggle, Todd discovers the deranged beggar woman he recently murdered was actually his long-suffering wife, Lucy, whom Lovett had deceitfully claimed was dead. Heartbroken and enraged by Lovett’s betrayal, Todd dances with her in a grim waltz before throwing her into her own bakehouse oven. Ultimately, a traumatized and vengeful Pirelli boy named Toby slits Todd's throat with his own razor, ending the reign of the demon barber as Todd bleeds out over the corpse of his lost wife.