Proprietor of Eagle Eyes detective agency in London. (Bachelors Anonymous)
Fauntleroy
With Digby's. (Pigs Have Wings)
Samuel Galer
A private detective with Dodson's Private Enquiry Agency of Bishopsgate St., EC., (A Gentleman of Leisure) and/or of Wragge's Detective Agency, Holborn Bars, EC. (The Gem Collector).
Inspector Jarvis
Of Scotland Yard, telephoned in One Touch of Nature.
Mr Jellaby
Investigator with the Argus Enquiry Agency, mentioned in Frozen Assets.
Jones
With the Argus Enquiry Agency. (Summer Lightning)
Detective Inspector Mould
Character in the book Strychnine in the Soup by Horatio Slingsby (not a 'real' person). (Strychnine in the Soup)
Adrian Mulliner
With Widgery and Boon, Investigators of Albemarle Street, London. (The Smile That Wins)
Murphy
With the Argus Enquiry Agency. (Summer Lightning)
North
With Digby's. (Pigs Have Wings)
Elliott Oakes
A junior with Paul Snyder's Detective Agency. (Death at the Excelsior)
Cyril Pemberton
A detective of the 'heavy' variety, with the Eagle Eyes agency of London in Bachelors Anonymous.
Employed by Mrs Gedge in Hot Water. Works for the James B. Flaherty Detective Agency of New York, offices at 44th Street and 7th Avenue.
Henry Pitfield Rice
Private detective working for Stafford's International Investigation Bureau, Strand, London in Bill the Bloodhound.
Inspector Roberts
A Scotland Yard detective who distrusts evidence. (The Pothunters)
Burdock Rose
A private detective, accompanied by his friend Wotsing. (The Strange Disappearance of Buxton-Smythe and The Adventure of the Split Infinitive).
Simmonds
Private detective working for Stafford's International Investigation Bureau, Strand, London in Bill the Bloodhound.
Susan Simmons
A private detective, worked undercover as a housemaid at Blandings Castle, employed by Rupert Baxter with whom she had worked previously. (Leave it to Psmith)
Paul Snyder
Proprietor of Paul Snyder's Detective Agency in New Oxford Street. (Death at the Excelsior)
Mr Stafford
Proprietor of Stafford's International Investigation Bureau, Strand, London. (Bill the Bloodhound).
A private detective from Chicago, last seen in Monte Carlo. (Rallying Round Old George)
Mr Sturgis
Proprietor of the International Detective Agency of New York. (Piccadilly Jim)
Miss Trimble
Employee of the International Detective Agency of New York. She has speech like a machine gun, through clenched teeth. A socialist, with no time for the rich or their grand manner. Also a suffragist and hates men. Hired by Nesta Pett to keep an eye on a member of staff and a guest. She poses as a parlourmaid.
Unnamed
1. Employee of Wragge's Detective Agency, Holborn Bars, EC, posing as Sir Thomas Blunt's valet. (A Gentleman of Leisure)
2. Samuel Galer, posing as a friend of John McEachern. (The Gem Collector)
3. An unnamed operative of the Quick Results Agency posed as a caddie when employed by Gladstone Botts in High Stakes. See also Brown and Delancey above.
Wraxhall Detective Agency
Employed by Sir George Pyke to find Felicia Hammond in Bill the Conqueror, but failed.
