The Case of the Naval Officer's Code

It was the third Wednesday of October 1893 when Lieutenant Henry Marsh, of HMS *Excellent* at Portsmouth, came to our rooms by the early train, in plain clothes and a state of professional terror.

"My desk was rifled some hour between Sunday evening and Monday morning, Mr Holmes. The draft of a signal-code I have been preparing for the Admiralty is gone. I had the only key on my watch-chain; the desk was forced. My superior speaks of court-martial. There is also - there is also a difficulty with my brother-in-law, who is in town from Wednesday and has been for some time uncomfortable with my career."

We took the morning train to Portsmouth. On the dockyard rank a thin four-wheeler waited, painted dark green, with a chip on the off-side lamp; its driver wore a hat with a green band and bore a port-wine stain on his left temple, and he tipped his whip-handle to the brim as we passed. Lieutenant Marsh's quarters were upon the second floor of the wardroom block, the desk upon the inner wall, the lock visibly forced.

The Scene

Hand-drawn case map for The Case of the Naval Officer's Code, showing Lieutenant Marsh's quarters, HMS Excellent, Portsmouth dockyard. — The ground in question.

Setting: Lieutenant Marsh's quarters, HMS Excellent, Portsmouth dockyard
Time: Wednesday morning, third Wednesday of October 1893
Weather: Cool; a light wind off the harbour; gulls overhead
Atmosphere: A small wardroom-quarter with a sea-going chest and a writing-desk under the porthole; the smell of brass-polish and sail-canvas; the masts of HMS Victory visible across the basin.

The Suspects

Lieutenant Henry Marsh

Junior naval officer; the client

A precise, anxious officer of twenty-eight, three years at the gunnery school, who had drafted the signal-code in his own hand over the past six months and held the desk-key on his watch-chain. He had recently been seen in low spirits.
Captain Frowde

Marsh's superior at Excellent

A grave, careful captain of fifty, much trusted in the service, who had himself authorised the code's drafting and stood, on its loss, to face questions from the Admiralty Office.
Mr Plumtree

Marsh's brother-in-law; a journalist for the Mall Gazette

A worldly, sharp-tongued man of forty, married to Marsh's elder sister, recently in Portsmouth and disposed to question the Lieutenant about a matter of three years' standing in the West Indies. He had the easy manners of a man who knew most of London's secrets and was not above using them.
Sub-lieutenant Pole

Marsh's neighbour at Excellent; borrowed the desk on Saturday

A bluff young sub-lieutenant of twenty-three, who had borrowed Lieutenant Marsh's desk for a half-hour's letter-writing on Saturday, with the lieutenant's express permission, and had returned the key at five.

The Evidence

The forced lock

The desk's lock had been forced from the front, the brass plate prised outward and the housing splintered. Holmes examined the splintering with his glass; the work had been done with a flat instrument applied at the very angle a man would attempt who had to know the shape of his target unseen.
The intimacy of the rifling

The contents of the desk had been rifled with a sure hand: the right-hand pigeon-hole opened first, the left untouched, the centre drawer emptied of papers but not of the watercolour Marsh kept of his sister. Only the man who knew which drawer held the code-draft, and which the watercolour, would have searched in this order.
Mr Plumtree's recent enquiries

The brother-in-law had been heard at the wardroom on Sunday evening to ask, with apparent idleness, about the stations of the Caribbean squadron in '90. The question had been turned aside; he had not pressed it.
The signal-code itself

The draft signal-code, when sought in the desk, was gone. A search of the lieutenant's own quarters by Captain Frowde found a clean copy of the same in a sealed envelope upon the inside of the lieutenant's mattress.
An old letter from the West Indies

In the rifled desk's centre drawer, beneath the displaced papers, lay an old envelope addressed to Lieutenant Marsh from St Christopher's, dated 1890. The flap had been opened recently; a faint freshness in the gum belied its years.

Statements & Testimony

Sub-lieutenant Pole Reliable

Neighbour at Excellent

“"Marsh lent me the desk on Saturday afternoon, sir, for half an hour. I locked it again at five and returned the key. He was at the gunnery school; I went up to the wardroom for tea. I saw nothing irregular."”
Captain Frowde Reliable

Marsh's superior

“"Lieutenant Marsh has been a careful officer, Mr Holmes. The signal-code was at his work these six months. Mr Plumtree I have not met; the wardroom mess speaks of him as a London journalist. The matter weighs heavily upon Marsh; he is in a state I have not seen before."”

The Scene

The Suspects

The Evidence

The forced lock

The intimacy of the rifling

Mr Plumtree's recent enquiries

The signal-code itself

An old letter from the West Indies

Statements & Testimony

Your Verdict