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ArchiveJuly 27, 2026Sleuth
Case File · Audit · No. 033

Daily Casefile · Audit

The Doubled Dozen at Dalrymple's Studio

6 min

Dalrymple & Sons Portrait Photography Studio on Princes Street charges sitters a fixed fee per portrait session and remits a percentage of gross takings to the Edinburgh Photographers' Guild each quarter. Mr. Archibald Dalrymple has submitted his sitting fees daybook for the quarter ending 30 June 1916, claiming reimbursement from the Guild's wartime relief fund for materials consumed in charitable sittings offered free of charge to departing soldiers. The Guild treasurer has asked an independent auditor to verify that the number of sittings recorded in the daybook agrees with the studio appointment register and the plate-glass order invoices. Five of the six daybook lines can be squared against the supporting records; your task is to identify the one line that cannot.

The scene

Dalrymple & Sons Portrait Photography Studio, Edinburgh, Scotland, 1916

Source documents

  • Studio Appointment Register, Dalrymple & Sons, April–June 1916
  • Invoice from Ilford Photographic Supplies, Edinburgh Depot, 15 July 1916
  • Letter from Edinburgh Photographers' Guild Treasurer, Mr. W. H. Jardine, to Mr. Dalrymple, 4 March 1916
  • Guild Inspector's Spot-Check Report, Dalrymple & Sons, 1 July 1916

Play today’s Audit.

This case first aired on July 27, 2026. A fresh audit runs every morning — same rules, five minutes, one solution.