Jeffries Sets a Trap to Test Thorwald

Jeffries Sets a Trap to Test Thorwald is a sequence of improvised tests in which Hal Jeffries tries to turn Lars Thorwald’s own reactions into evidence. Unable to persuade Inspector Boyne through ordinary reporting, Jeffries uses a blank envelope, calls, and a risky staged intrusion to unsettle Thorwald from across the courtyard. The traps do not make Thorwald disclose a hiding place, but they sharpen Jeffries’s reading of the building and ultimately direct the police to Anna Thorwald’s concealed body.

From Police Failure to a Personal Test

After Inspector Boyne leaves, Jeffries remains convinced that Thorwald is guilty but recognizes that he cannot make the police accept a case he cannot prove. The immediate consequence of that dismissal is a change of method: instead of asking Boyne to act on his suspicion, Jeffries decides to test it himself. He believes Thorwald is guarded against the police but less protected against an individual acting without their authority.

Jeffries asks Sam to find the Spyglass they had used on a cabin cruiser. When Sam brings it in, Jeffries writes a six-word question on a piece of paper, seals it in an unmarked envelope, and sends Sam to slip it beneath the door of Thorwald’s fourth-floor rear apartment at 525 Benedict Avenue. He also instructs Sam to ring the outside doorbell after reaching safety, drawing attention toward the building entrance and away from the delivery. The message itself contains no explanation or accusation; its purpose is to confront Thorwald with the suggestion that someone knows what happened to his wife.

Jeffries watches Thorwald find and read the note. Thorwald first checks the doorway, then retreats farther into his rooms. After reading, he shows visible shock and panic, approaches the door cautiously, and returns to the room for a drink while continuing to watch the entrance. Jeffries takes this reaction as confirmation of guilt. The scene provides no confession and does not independently establish what Thorwald has hidden, but Jeffries treats the change in Thorwald’s expression and behavior as the decisive response his first test was designed to elicit.

Planning a More Elaborate Deception

Jeffries’s next objective is more specific: he wants Thorwald to reveal where the concealed evidence is, so that he can pass its location to the police. He studies Thorwald’s movements and considers how to provoke a brief, involuntary reaction that could point toward a particular place. An accidental alignment he observes between Thorwald and a landlord showing a prospective tenant an apartment lodges in his mind, although he cannot initially identify what seems wrong about it.

After dark, Jeffries finds Thorwald’s telephone listing in a directory: 525 Benedict Avenue, with the number SWansea 5-2114. He calls without disguising his voice, telling Thorwald that he received the note. He then invents a private arrangement involving money and a meeting at Lakeside Park. Thorwald says that he has only about seventy dollars available; Jeffries accepts this as the basis for the plan and gives him roughly half an hour to travel to the park and back. The proposed meeting is a ruse. Jeffries intends to use Thorwald’s absence to alter the scene in his apartment and then claim to have found what Thorwald is hiding.

Before Thorwald leaves, Jeffries calls Sam in again and explains that the next task is dangerous. He directs Sam to cross the back-yard fences, climb the fire escape, and enter Thorwald’s apartment through a window left slightly open. Sam is not to search for an object: the police have already searched. Instead, he must make small disturbances in all three rooms by shifting furniture, turning up the edge of each rug, and leaving the closet doors open. Jeffries gives him his own wristwatch and sets a twenty-five-minute limit. He further instructs Sam to close the window securely when leaving and escape through the front of the building, rather than return by the fire escape.

Sam reaches the apartment by way of the basement, fences, and fire escape. Jeffries watches from his window but cannot act as a lookout or shield Sam if Thorwald returns. Although the twenty-five minutes seem to Jeffries to stretch to fifty, Sam completes the task, closes the window, turns out the light, and gets out safely. Jeffries tells him to keep the light off when he returns and to get a drink. The operation has introduced the appearance of a search without uncovering anything itself; its value depends entirely on how Thorwald will respond to the claim that Jeffries has discovered the hiding place.

The Second Call and Its Failure

Thorwald returns twenty-nine minutes after leaving for Lakeside Park, leaving little margin for Jeffries to make the second call. Jeffries has been repeatedly dialing and hanging up so that he can reach Thorwald quickly when he returns. The telephone rings before Thorwald has moved far from the light switch. Jeffries claims that he did not attend the meeting because he saw Thorwald carry a gun, then says that he learned more during Thorwald’s absence and knows where the hidden thing is. He does not identify a location; the claim is meant to make Thorwald look around or otherwise betray what he believes Jeffries has discovered.

Thorwald puts down the receiver and looks across his living room in a broad sweep, without focusing on a particular object or place. He returns to the phone, calls Jeffries a liar, and ends the exchange. The test has not produced the pointed reaction Jeffries wanted. Thorwald has neither led him to a hiding place nor confirmed that he has looked for anything. Jeffries nevertheless reads the denial as a limited admission: if there were nothing concealed on the premises, he reasons, Thorwald would not need to reject the claim in that way. He regards this as a sterile victory, since it leaves him without the location he needs to give the police.

The contrast between the two tests matters. The note provokes a conspicuous response that Jeffries interprets as guilt; the false claim of discovery produces no useful direction. The second failure also exposes the limits of watching from a distance: Jeffries can observe Thorwald’s movement and expression, but cannot know exactly what Thorwald is thinking or see what happens outside his view. His staged disturbance supplies a pretext, not evidence that a particular room or object has been found.

The Clue in the Building’s Vertical Alignment

While working out how to force another reaction, Jeffries recalls the earlier view of the landlord and prospective tenant moving through an apartment on the sixth floor while Thorwald moved through the fourth. The two parties had appeared first at their respective living-room windows, disappeared behind a stretch of wall, and reappeared at the kitchen windows. At the time, the near-simultaneous movements seemed like an odd coincidence, but one detail had disturbed him: their parallel paths contained an upward jump.

The distinction is spatial. Jeffries recognizes that the flaw was vertical rather than horizontal, and that the people he had watched were not moving through equivalent positions in the building. He connects that remembered mismatch to the unfinished apartment above Thorwald’s. In the Rear Apartment on the Fifth Floor at 525 Benedict Avenue, the Cement Kitchen Floor in the Fifth-Floor Apartment had been raised above the level of the other rooms. Jeffries tells Inspector Boyne that the construction both met fire regulations and created a dropped living-room effect at low cost. That difference in floor level makes the otherwise puzzling jump meaningful and points to a place the previous search of Thorwald’s apartment had not examined.

Inspector Boyne acts on the new lead, going through the basement and across the fences to save time. Since electricity has not yet been connected in the unfinished apartment, the searchers use torches. About half an hour after beginning, they signal Jeffries that the search has succeeded. They have found Anna Thorwald’s body in the apartment above Thorwald’s. The earlier police search had concentrated on the contents of the trunk and had not checked the woman’s description against details supplied by another tenant; Boyne later acknowledges that this omission contributed to the delay.

The trap therefore succeeds indirectly. Neither the note nor the telephone deception makes Thorwald disclose the hiding place, and Sam’s staged rearrangement does not itself uncover the body. Instead, the attempts keep Jeffries observing, comparing, and revisiting a detail he could not initially explain. His final inference converts a visual irregularity between floors into a physical location for the police to search. The episode’s decisive result is not a confession extracted from Thorwald, but a change in how Jeffries reads the architecture around him.