The Detective’s DeskInez Lane
Recorded packet handler
“Establish my packet, location and event from the verified custody record.”
HARD · CASE FILE
Two distances to the map room
Hard · EAST SURVEY OFFICE
Two survey readings locate a point on a rectangular street grid. Straight-line distance would identify the wrong place; only the printed distance convention applies. The archive retained the competing reconstructions in separate packets. Rebuild their custody events, identify the proposal supported by the analytical records, then name that packet’s recorded handler. The packet events form a separate ordered register; do not substitute a calculated clock time for a review-slot label.
Read the case file below, or open the interactive desk to examine records, keep notes and submit your reasoning. These are the case materials, without the solution.
Your assignment
Who handled the packet containing the supported reconstruction?
- The analytical records answer the analytical question; worksheet records establish the packet custody reconstruction. Candidate proposals and supplementary recollections are claims to test.
- There are 5 ordered events. Use each listed person, location and item once in its column. “A immediately before B” means A is in the row directly above B, with no row between them.
- 6 verified records support the complete submission. Keep the separate context note out of the proof.
- No outside facts or unstated exceptions are required. The complete board and report are assessed together.
People and accounts
Vera Pine
Recorded packet handler
“Establish my packet, location and event from the verified custody record.”
Jules Ash
Recorded packet handler
“Establish my packet, location and event from the verified custody record.”
Inez Shore
Recorded packet handler
“Establish my packet, location and event from the verified custody record.”
Milo West
Recorded packet handler
“Establish my packet, location and event from the verified custody record.”
Case records
Read each record on its own terms. A claim made by a person is different from a fact established by an independent record.
VERIFIED RECORD B
East beacon
The same point is eight units from beacon (6,0), using the same grid-distance convention.
Combine the second equation with the first; do not use Euclidean circles.
VERIFIED RECORD C
Survey index
(2,4)=Map Room; (4,2)=Seal Room; (3,3)=Reading Room; (2,2)=Store Room. The index uses the same axes as both beacons.
Convert the unique coordinate into the requested room name.
CONTEXT NOTE
Survey equipment
Both readings came from a calibrated instrument. No additional measurement error is implied.
This describes the setting; it does not establish the requested result.
VERIFIED RECORD A
West beacon
Coordinates are integers 0–6 on both axes. Distance is |x1−x2|+|y1−y2|. The point is six units from beacon (0,0).
Translate the first reading into x+y=6 on the stated grid.
RECONSTRUCTION RECORD
Packet proposal index
This is the same investigation’s packet custody record. There are 5 ordered events, labelled Review 1, Review 2, Review 3, Review 4, Review 5. Each listed person, location and item occurs exactly once. These slots describe record order, not times from the analytical problem. Each packet contains the proposed reconstruction shown in the index. Solve the original three analytical records to identify the supported proposal, then trace its packet to its handler. Control packets have no proposal and cannot be the target.
- The event handled by Inez Lane occupies slot 2 (Review 2).
- The event involving “Packet Birch” and the event involving “Packet Dune” are exactly 3 positions apart, with 2 intervening events; this alone gives no direction.
- The event involving “Packet Birch” occurs earlier than the event handled by Vera Pine, without claiming they are consecutive.
- The event handled by Milo West occurs immediately before the event at Review bench (consecutive rows, with no event between them).
| Packet | Proposed analytical answer |
|---|---|
| Packet Amber | Store Room |
| Packet Birch | Map Room |
| Packet Cedar | Reading Room |
| Packet Dune | Seal Room |
| Packet Elm | Control packet: no analytical proposal |
Use each column’s choices exactly once. Verified relationships govern the board; proposed answers and later recollections do not override them.
RECONSTRUCTION RECORD
Custody sequence
The relationships below were verified independently. “A immediately before B” means A is in the row directly above B, with no row between them. Keep relationships from all worksheet sources together.
- The event at Intake counter occupies slot 1 (Review 1).
- The event handled by Inez Lane is the same event as the event involving “Packet Birch”.
- The event handled by Jules Ash is the same event as the event at Dispatch shelf.
Use each column’s choices exactly once. Verified relationships govern the board; proposed answers and later recollections do not override them.
RECONSTRUCTION RECORD
Cross-check and accounts
The relationships below were verified independently. “A immediately before B” means A is in the row directly above B, with no row between them. Keep relationships from all worksheet sources together.
- The event at Seal station and the event at Dispatch shelf are exactly 2 positions apart, with 1 intervening event; this alone gives no direction.
- The event involving “Packet Birch” occurs immediately before the event involving “Packet Cedar” (consecutive rows, with no event between them).
- The event handled by Vera Pine occurs earlier than the event involving “Packet Elm”, without claiming they are consecutive.
Use each column’s choices exactly once. Verified relationships govern the board; proposed answers and later recollections do not override them.
Questions to resolve
Which indexed room occupies the surveyed point?
Match every recorded item to its event location or reviewer.
- Packet Amber
- Packet Birch
- Packet Cedar
- Packet Elm
- Packet Dune
At which recorded event was the target packet handled?
Use the interactive case desk to select your finding and cite the records that support it. The answer is checked there, and your progress stays in your browser.
Build your finding
Compare the records with each account. Work out what the evidence establishes, then separate that finding from anything it does not prove.