The Proof Ledger
Secure file Ref. PL–A01

Confidential / Candidate evaluation

Preliminary Candidate Assessment

This short file is designed to test your ability to isolate a pattern inside ordinary records.

Your task is simple:

Find the one reservation that matches all five clues.

The register below contains ordinary hotel stays, misleading similarities, and one correct answer.

Read carefully. Do not guess. Every clue matters.

01

Preserved statement

Known Fact

During an earlier investigation at the Argos Hotel, one guest reported suspicious activity near room 407.

The room itself was not entered, but the incident was serious enough to preserve a short extract from the hotel register.

Your task is to identify the one reservation most likely connected to the incident.

02 / Evidence criteria

Five clues. One match.

All conditions must be satisfied by a single reservation.

  1. 01

    The reservation lasted exactly two nights.

  2. 02

    The guest arrived after 18:00.

  3. 03

    The guest declared exactly one piece of luggage.

  4. 04

    The guest made a staff-avoiding special request.

  5. 05

    The room number ends with the same digit as the targeted room: 407.

03 / Reference index

Special Request Codes

Staff-avoiding requests LA, EC, NH, KR

LA
Late arrival
EC
Express checkout
NH
No housekeeping
KR
Key left at reception
QR
Quiet room
CV
Courtyard view
WU
Wake-up call
PI
Printed invoice
EP
Extra pillow
AE
Away from elevator

04 / Preserved records

Argos Hotel Register

Extract: April 03–20 / 30 reservations

Argos Hotel register containing thirty reservations
ID First Name Last Name Arrival Time Departure Room Lugg. Request
A-001ClaraBentonApr 0315:20Apr 052142QR
A-002DanielPierceApr 0318:35Apr 044071NH
A-003OwenMarshApr 0419:10Apr 062181KR
A-004AliceNortonApr 0417:45Apr 063071EC
A-005SimonValeApr 0520:05Apr 075072NH
A-006LydiaCrossApr 0518:50Apr 074101LA
A-007EthanMooreApr 0616:30Apr 081071NH
A-008GraceMillerApr 0621:15Apr 082070EC
A-009HenryLockeApr 0718:10Apr 093171QR
A-010NoraFieldApr 0719:25Apr 106071LA
A-011PeterWalshApr 0814:50Apr 101171NH
A-012EmmaCarterApr 0818:05Apr 104051EC
A-013MilesArcherApr 0920:40Apr 113091KR
A-014JuliaStoneApr 0919:55Apr 115071PI
A-015AdamBrooksApr 1018:30Apr 122172KR
A-016HelenGrantApr 1013:15Apr 124071EC
A-017VictorHayesApr 1122:05Apr 136011LA
A-018RachelQuinnApr 1118:45Apr 123071NH
A-019MartinWebbApr 1219:30Apr 142061KR
A-020SophieReedApr 1220:15Apr 145071EP
A-021AdrianBlakeApr 1318:42Apr 153071NH
A-022OliviaShawApr 1318:42Apr 153041NH
A-023NathanColeApr 1417:10Apr 166071KR
A-024LauraFinchApr 1418:55Apr 162073EC
A-025ThomasGreyApr 1521:20Apr 171071AE
A-026MeganFrostApr 1519:05Apr 175121LA
A-027BrianEllisApr 1618:20Apr 186071CV
A-028SarahHoltApr 1620:45Apr 182181KR
A-029ColinDrakeApr 1718:15Apr 195070NH
A-030IsabelLaneApr 1719:50Apr 203071EC

Swipe or scroll horizontally to inspect the complete register.

05 / Candidate response

Submit Your Answer

Enter the reservation ID you believe matches all five clues.

Your timer will stop only when the correct reservation is validated.

Continue the investigation

Ready for the full case?

Search an entire year of hotel records and expose the pattern hidden inside Case 001.