| Hon. Freddy | Arbuthnot | Friend of Peter Wimsey, stock market adviser |
| Judge | Bancroft | Likely judge for Harriet's retrial |
| Captain Tommy | Bates | Guest at Christmas tea at Duke of Denver's home (Wimsey's family estate) |
| Sir Impey | Biggs | Defending attorney for Harriet Vane |
| Miss Caroline | Booth | Mrs. Wrayburn's nurse/companion |
| Philip | Boyes | Murder victim, Harriet's lover, 36 yrs. old |
| Rev. Arthur | Boyes | Philip Boyes' father, parson |
| Mrs. Gracie | Bulfinch | Former bar maid at the Nine Rings, found the empty packet of powder used by Philip Boyes |
| | Bunter | Wimsey's butler & friend |
| Mr. | Challoner | Harriet Vane's literary agent |
| Miss Katherine | Climpson | Peter Wimsey's "enquiry agent," proprietor of the "Cattery" |
| Mr. | Cole | Boyes' publisher, of Grimsby & Cole |
| Mr. | Crofts | Defense solicitor, of Crofts & Cooper |
| Judge | Crossley | Judge in Harriet Vane's trial |
| Mrs. "Freak" | Dimsworthy | Guest at Christmas tea at Duke of Denver's home (Wimsey's family estate) |
| Mr. & Mrs. | Dyer | Neighbors of Philip Boyes |
| Miss | Etheredge |
Fellow boardinghouse residents with Miss Climpson in Windle, Westmorland |
| Mrs. | Featherstone | Guest at Christmas tea at Duke of Denver's home (Wimsey's family estate) |
| Stephen | Fordyce | Conducted autopsy on Philip Boyes |
| Cremona | Garden | Former actress, Philip Boyes' great aunt, aka Mrs. Wrayburn, nee Rosanna Hubbard |
| Dr. | Grainger | Philip Boyes' physician |
| Dr. | Green | Philip Boyes' physician |
| Salcombe | Hardy | Reporter covering the trial |
| Mr. | Harringay | Guest at Christmas tea at Duke of Denver's home (Wimsey's family estate) |
| Mrs. | Hodges | Urquhart's office cleaning lady |
| Nina | Kropotky | Hostess of avantgarde party, acquaintance of Philip Boyes |
| Rachel | Levy | Freddie Arbuthnot's fiancée |
| Mrs. | Liffey |
Fellow boardinghouse residents with Miss Climpson in Windle, Westmorland |
| Cuthbert | Logan | Reporter for a morning newspaper |
| Sir James | Lubbock | Conducted autopsy on Philip Boyes |
| Sylvia | Marriott | Friend of Harriet Vane |
| Mrs. | Merdle | Nickname of Wimsey's car |
| Miss Joan | Murchison | Secretary in Urquhart's office, one of Miss Climpson's employees |
| Waffles | Newton | Reporter covering the trial |
| Chief Inspector Charles | Parker | Police detective, friend of Wimsey |
| Mrs. | Pegler | Fellow boardinghouse residents with Miss Climpson in Windle, Westmorland |
| Mrs. | Pettican | Norman Urquhart's cook |
| Marjorie | Phelps | Potter, friend of Wimsey's |
| Eiluned | Price | Friend of Harriet Vane |
| Bella | Rumm | Bill's wife & Esmeralda's mother |
| Bill | Rumm | Locksmith, former burglar & safecracker, aka "Blindfold Bill" |
| Miss | Titterton | Guest at Christmas tea at Duke of Denver's home (Wimsey's family estate) |
| Joey | Trimbles | Host of another party, acquaintance of Philip Boyes |
| Miss | Tweall |
Fellow boardinghouse residents with Miss Climpson in Windle, Westmorland |
| Norman | Urquhart | Philip Boyes' cousin, solicitor |
| Harriet | Vane | Defendant in murder trial, 29 yr. old mystery author |
| Ryland | Vaughan | Friend of Philip Boyes |
| Dr. | Weare | Philip Boyes' physician |
| Hannah | Westlock | Norman Urquhart's maid |
| Nurse | Williams | Philip Boyes' nurse |
| Dowager Duchess | Wimsey | Peter Wimsey's mother |
| Gerald | Wimsey | Wimsey's older brother, Duke of Denver, Helen's husband |
| Helen | Wimsey | Wimsey's sister-in-law, Duchess of Denver, Gerald's wife |
| Lord Peter | Wimsey | Aristocrat attending the trial, amateur detective, 2nd son of the Duke of Denver |
| Mary | Wimsey | Peter Wimsey's older sister (romantically involved with Charles Parker) |
| Esmeralda Hyacinth | | Bill's daughter |
| Mabel | | Manicurist |