The Detective’s DeskInez Shore
Recorded packet handler
“Establish my packet, location and event from the verified custody record.”
HARD · CASE FILE
The dual-circuit door
Hard · NORTHBRIDGE SECURE CORRIDOR
The corridor’s lock needs power from A and at least one backup circuit. A crossing must remain powered throughout, not merely at its beginning. 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 Lane
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 C
Crossing protocol
A crossing takes 7 uninterrupted minutes. It may start when power begins and finish exactly when power stops. The courier is ready at 20:00.
Fit a complete seven-minute interval inside a powered segment.
CONTEXT NOTE
Door finish
The door has a brass handle. It adds no mechanical override.
This describes the setting; it does not establish the requested result.
VERIFIED RECORD A
Circuit logs
A is live 20:02–20:19. B is live 20:00–20:08. C is live 20:11–20:25. Times are civil. An ending time is the instant power stops.
Map the live intervals for all three inputs.
VERIFIED RECORD B
Lock logic
The door is powered exactly when A AND (B OR C) is live. There is no stored battery and no other power source.
Intersect A with the union of B and C, preserving the gap.
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 5 (Review 5).
- The event involving “Packet Birch” occurs earlier than the event involving “Packet Cedar”, without claiming they are consecutive.
- The event handled by Inez Shore is the same event as the event at Intake counter.
| Packet | Proposed analytical answer |
|---|---|
| Packet Amber | 20:11–20:18 |
| Packet Birch | 20:08–20:15 |
| Packet Cedar | 20:02–20:09 |
| Packet Dune | 20:12–20:19 |
| 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 Seal station occupies slot 1 (Review 1).
- The event handled by Inez Lane and the event involving “Packet Cedar” are exactly 2 positions apart, with 1 intervening event; this alone gives no direction.
- The event handled by Inez Shore occurs earlier than the event at Dispatch shelf, 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.
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 Review bench and the event involving “Packet Elm” are exactly 4 positions apart, with 3 intervening events; this alone gives no direction.
- The event involving “Packet Elm” occurs immediately before the event handled by Milo West (consecutive rows, with no event between them).
- The event handled by Vera Pine is the same event as the event involving “Packet Dune”.
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 complete safe crossing interval?
Match every recorded item to its handler or reviewer.
- Packet Elm
- Packet Birch
- Packet Cedar
- Packet Dune
- Packet Amber
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.