8 exhibits · 4 people · 3 deductions Read at your own pace · Free to investigate
The evidence Open each exhibit to inspect the record Scene photograph · Bridge approach after closure · Open full photograph Exhibit 01 · The reel A spliced voice Mara’s voice rides over the station’s retired 1979 jingle. A grease-pencil X and an unusual paired 3 mm notch mark the splice at “bridge.” The warning is physically assembled, not a continuous studio recording. Exhibit 02 · Inspection report A crack dismissed At 4:30 p.m. on May 8, the bridge engineer measures a 19 mm crack at the east bearing, up from 11 mm the week before. His carbon reads “CLOSE IMMEDIATELY” in red pencil; the filing copy has a “ROUTINE” stamp over the same line. Both carry his initials. Exhibit 03 · Switchboard An early inquiry At 3:51 a.m. the operator writes “county office—did the six o’clock tape arrive?” The switchboard trace goes to the payphone opposite the station, not a county extension. A witness sees a person in a county records jacket leave the booth but cannot identify a face. Exhibit 04 · Date stamp Tomorrow is unreliable The station clock lost power at 12:03 a.m. and reset to May 10 instead of May 9. Two unrelated news reels carry the same wrong date. The sleeve marked “tomorrow” was stamped by that clock. Exhibit 05 · Dispatch sheet Barriers at 5:20 The 5:20 a.m. dispatch entry cites closure authority 41-B, a form retired April 1. A county records checkout card shows Len Mercer signed out the remaining 41-B pad at 3:35 a.m.; the carbon of the dispatched order has the same torn lower edge as that pad. Exhibit 06 · Engineer’s car Ten seconds of tape A ten-second fragment in the engineer’s car begins after the station jingle and lacks the first warning sentence. Its leader has old station tape adhesive. It shows he possessed a copy, but its missing opening does not show who made the original. Exhibit 07 · Station archive The missing phrase The archive log indexes “east bridge” in Mara’s April flood bulletin and “turn back now” in a 1979 road-safety spot. Mercer serviced that archive in 1979. Neither phrase was spoken at the station on May 9. Exhibit 08 · Payroll log One person in both places Former station technician Len Mercer now works in county records. His time sheet changes a 3:40 a.m. exit to 5:40; under side light the first digit remains visible. His old splicer in the records storeroom cuts paired 3 mm notches like those on the warning reel.
Reconstructed timeline Previous day The engineer flags the crack on a carbon copy; the filed report says routine. 3:40 a.m. Mercer leaves county records, according to the original payroll entry. 3:51 a.m. A payphone caller asks the station about a tape. 4:06 a.m. The assembled warning is delivered. 5:20 a.m. A crew closes the eastern approach using a retired authorization number. 6:14 a.m. The east support fails; the closure keeps vehicles away.
People in the file Mara Bell Her voice is on the tape, but its phrases predate the event.
The engineer Knew the bridge was unsafe; denies issuing the closure order.
Len Mercer Worked in both station archives and county records. His time sheet, checkout card, and old splicer leave a trail.
The dispatcher Accepted an obsolete authorization number and sent the crew.
Close the case Study the exhibits, then make three deductions. Each answer has a clue trail in the file.
01 · How could someone foresee the bridge failure? The urgent inspection carbon A tape from the future A weather forecast
Show hint 02 · Who assembled and delivered the warning? Mara Bell The engineer Len Mercer
Show hint 03 · How did barriers appear before the collapse? A forged order using retired authorization 41-B The engineer openly ordered a closure The crew happened to be nearby
Show hint Check deductions Reveal reconstruction (no rank credit) Another file awaits Case 001: The room that was never rented A check-in vanishes from the register. The guest turns up somewhere nobody looked.
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Original fictional mysteries. The people, locations, and records in these files are invented. 
