A desperate and unemployed young writer, known simply as "The Young Man," seeks inspiration for his debut novel by shadowing strangers through the bustling streets of London. Initially, he establishes strict rules about whom to follow and for how long, but his resolve quickly evaporates as he becomes captivated by a sophisticated and handsome man dressed in a dark suit. This man, who notices he is being pursued, confronts the Young Man and introduces himself as Cobb. Revealing his identity as a serial burglar, Cobb invites the Young Man, who goes by "Bill," to join him on a series of burglaries.
For Cobb, the material gains from these crimes seem trivial. He derives excitement from going through the personal belongings of his victims and indulging in their wine. He articulates his philosophy on burglary succinctly: > "You take it away, and show them what they had." This distinction captures his true passion: it’s not about wealth—it's about forcing victims to confront their own lives.
Eager to embrace Cobb's exhilarating lifestyle, the Young Man attempts his own break-ins with guidance from Cobb. Inspired, he changes his appearance, cutting his hair short and donning a dark suit. Adopting the name "Daniel Lloyd," after a credit card that Cobb gives him, he becomes infatuated with a blonde woman residing in one of the flats they burglarized together. This Blonde happens to be involved with a small-time gangster known only as the "Bald Guy," from whom she recently separated after he committed murder in her home.
As their relationship develops, the Young Man learns from the Blonde that the Bald Guy is blackmailing her with incriminating photographs. In a reckless move, he decides to break into the Bald Guy's safe, only to be caught by an unidentified man. In a panic, he strikes the man with a claw hammer, making off with the Bald Guy’s money and photographs. However, upon returning to his flat, he discovers that the pictures are harmless modeling shots.
When he confronts the Blonde, she reveals a shocking truth: she and Cobb have been conspiring to manipulate him into adopting Cobb's methods for burglaries. She indicates that Cobb had previously stumbled upon a murdered woman during one of his heists and is attempting to divert suspicion by creating the illusion of multiple burglars with a similar approach.
As a sense of betrayal sinks in, the Young Man makes the decision to turn himself in to the police. Meanwhile, the Blonde communicates her findings to Cobb, who then reveals his true allegiance—to the Bald Guy. It turns out that the story about the murdered woman was part of an elaborate ruse to mislead both the Young Man and the Blonde. The truth is that the Blonde has been blackmailing the Bald Guy with evidence of his crime, and he wants her silenced in a way that cannot be traced back to him.
In a chilling twist, Cobb murders the Blonde with the very same claw hammer the Young Man had used during his burglary of the Bald Guy’s safe, leaving it behind at the scene. When the police investigate the Young Man's claims, they discover the Blonde's lifeless body alongside the hammer with his fingerprints. Consequently, he finds himself entangled in a web of deceit, implicated in her murder, while Cobb skillfully evaporates into the crowd, leaving chaos in his wake.
