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WW-MC-2026-002 1920s
False Alibi

The Setup

Detective Sergeant Plimpton of Scotland Yard is investigating the theft of a sapphire necklace from Lady Cavendish's jewellery box during a weekend house party at Briarwood Manor, Sussex. The theft occurred sometime between Saturday evening's cocktail hour and Sunday morning. Three guests had opportunity: Mr Gerald Frome, a stockbroker; Mrs Daphne Lechford, a society portrait painter; and Captain Alistair Boyne, a retired cavalry officer. Each has provided a statement describing their movements that evening. One of them is lying about where they were.

👤 Witness Statement

Statement of Mr Gerald Frome, Stockbroker

After cocktails I retired to the billiard room with Captain Boyne and our host, Sir Reginald. We played three frames of snooker, finishing around half past ten. I went directly to my room in the east wing and read until I fell asleep with the lamp still burning. I heard nothing unusual.

Statement of Mrs Daphne Lechford, Portrait Painter

I spent the evening in the drawing room with Lady Cavendish and Miss Hartley, listening to the wireless. There was a rather fine concert broadcast from the Savoy — dance band music, very gay. We listened until nearly eleven, at which point Lady Cavendish went upstairs to retire. I remained in the drawing room sketching Miss Hartley's profile by the fire until perhaps quarter past eleven, then retired myself. I passed no one on the stairs and went straight to my room in the west wing, next door to Lady Cavendish's suite.

Statement of Captain Alistair Boyne, Retired Officer

After billiards I took a constitutional around the garden. It was a still, clear night — wonderful stars, not a breath of wind — and I could see the South Downs in the moonlight. I smoked two cigarettes on the south terrace, Turkish ones from that little shop on Jermyn Street, and then walked the full circuit of the house along the gravel path. I recall hearing the church clock at Briarwood village strike eleven as I came round the east side. I let myself in through the garden door on the north side at approximately five past eleven, bolted it behind me, and went up the back stairs. I noticed a light beneath Mrs Lechford's door as I passed.

The household retired by half past eleven. The necklace was discovered missing at eight o'clock Sunday morning when Lady Cavendish's maid opened the jewellery box.

The Question

One of the three guests is lying about their Saturday evening. Who stole the sapphire necklace, and what proves their alibi is false?