The Detective’s DeskInez Lane
Recorded packet handler
“Establish my packet, location and event from the verified custody record.”
HARD · CASE FILE
A bridge that opens late
Hard · BIRCH CANAL NETWORK
A courier leaves the depot at 18:00. A bridge schedule makes the shortest distance different from the earliest arrival. Waiting is allowed at junctions. 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 4 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.”
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.
CONTEXT NOTE
Delivery seal
The parcel bears a wax leaf emblem, which does not affect travel.
This describes the setting; it does not establish the requested result.
VERIFIED RECORD A
Complete walking map
Two-way edges: Depot–Bridge 4 min; Bridge–Archive 3; Depot–Canal 6; Canal–Archive 7; Bridge–Canal 2. There are no other paths.
The map supplies travel durations and alternatives.
VERIFIED RECORD B
Bridge control
Bridge–Archive cannot be entered before 18:09. Once entered, its entire three-minute crossing is permitted. All other edges are always open.
Waiting may make a shorter route useful.
VERIFIED RECORD C
Dispatch rule
Departure from Depot is exactly 18:00. Walk at the listed rates. Waiting is allowed, and arrival means reaching Archive, not beginning its final edge.
Compare complete arrival times, including any wait.
RECONSTRUCTION RECORD
Packet proposal index
This is the same investigation’s packet custody record. There are 4 ordered events, labelled Review 1, Review 2, Review 3, Review 4. 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 Milo West occupies slot 2 (Review 2).
- The event at Reading desk and the event involving “Packet Dune” are exactly 2 positions apart, with 1 intervening event; this alone gives no direction.
- The event involving “Packet Amber” occurs immediately before the event handled by Milo West (consecutive rows, with no event between them).
| Packet | Proposed analytical answer |
|---|---|
| Packet Amber | 18:13 |
| Packet Birch | 18:12 |
| Packet Cedar | 18:07 |
| Packet Dune | 18:09 |
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 2 (Review 2).
- The event handled by Inez Lane is the same event as the event involving “Packet Cedar”.
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 handled by Jules Ash occurs immediately before the event involving “Packet Cedar” (consecutive rows, with no event between them).
- The event at Review bench occurs earlier than the event handled by Milo West, 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
What is the earliest possible arrival time at the archive?
Which packet contains the supported analytical answer?
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.