The Detective’s DeskAsha Ford
Proposed deduction
“Take the 11:20 connection.”
MEDIUM · CASE FILE
The connection nobody waited for
Medium · BIRCH JUNCTION
Four travellers proposed a connecting departure after arriving at Birch. A train can be boarded only after the full transfer walk is finished. Also reconstruct the review register: it records who examined which source, independently of whether their later proposed answer is correct. Review slots describe order, not travel or clock times.
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 chose the earliest catchable connection?
- The analytical records answer the analytical question; worksheet records establish the review reconstruction. Candidate proposals and supplementary recollections are claims to test.
- There are 2 ordered events. Use each listed person and item once in its column. “A immediately before B” means A is in the row directly above B, with no row between them.
- 4 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
Bo Lane
Proposed deduction
“Take the 11:45 connection.”
Yves Cole
Proposed deduction
“Take the 11:31 connection.”
Zina Holt
Proposed deduction
“Take the 11:24 connection.”
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.
PRIMARY RECORD
Arrival and transfer
The incoming train arrives at 11:18 exactly. The walk to the connecting platform takes 7 minutes and cannot begin earlier. Boarding at the exact completion time is allowed.
This gives the earliest platform-ready time.
LINKED RECORD
Connecting departures
The only connecting departures are 11:20, 11:24, 11:31 and 11:45. No train waits for transferring passengers.
This lists the available departures.
CONTEXT NOTE
Station sign
The connecting platform has a blue information sign.
The sign colour supplies no timetable constraint.
RECONSTRUCTION RECORD
Review register
This is the same investigation’s document review record. There are 2 ordered events, labelled Review 1, Review 2. Each listed person and item occurs exactly once. These slots describe record order, not times from the analytical problem.
- The event reviewed by Yves Cole occupies slot 2 (Review 2).
Use each column’s choices exactly once. Verified relationships govern the board; proposed answers and later recollections do not override them.
RECONSTRUCTION RECORD
Review cross-check
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 involving “Connecting departures” occupies slot 1 (Review 1).
Use each column’s choices exactly once. Verified relationships govern the board; proposed answers and later recollections do not override them.
Questions to resolve
When was the primary analytical record reviewed?
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.