Crossover Cover: The Case of the Gilded Fly

Gervase Fen has an epiphany about the murder he is investigating, and hopes Gideon Fell never becomes privy to his lunacy. The reference to John Dickson Carr’s sleuth Dr. Gideon Fell reinforces Fen’s inclusion in the CU.

Crossover Cover: Swan Song

A journalist asks Gervase Fen for an interview for her series on famous detectives, adding that she’s hoping to also speak with H.M., Mrs. Bradley, and Albert Campion, among others. The references to Carter Dickson’s (pseudonym for John Dickson Carr) Sir Henry “H.M.” Merrivale, Gladys Mitchell’s Mrs. Beatrice Adela Lestrange Bradley, and Margery Allingham’s Albert Campion confirm that Gervase Fen is in the CU.

Crossover Covers: Inspector Wilkins

This series of novels is an affectionate pastiche of 1930s locked room mystery novels, with Inspector Wilkins repeatedly having to investigate murders at the home of the unlucky Earl of Burford. All three novels have references to detective fiction of that era, which treat the characters mentioned as real people. In The Affair of the Bloodstained Egg Cosy (published in 1975), Agatha Christie's Hercule Poirot is referred to by Wilkins. The Affair of the Mutilated Mink (1983) has several references: Dorothy L. Sayers' Lord Peter Wimsey; Michael Innes' Sir John Appleby (along with Richard Eliot's book The Spider Bites Back from the Appleby novel Stop Press); Ngaio Marsh's Inspector Roderick Alleyn; Agatha Christie's Ariadne Oliver (from the Hercule Poirot books, as well as the non-series novel The Pale Horse) and her book Death of a Debutante (mentioned in Mrs. McGinty's Dead); and The Screaming Bone by Annette de la Tour, the pen name of Mr. Judd in Edmund Crispin's Gervase Fen novel Buried for Pleasure. The third and final Wilkins novel, The Case of the 39 Cufflinks, refers to Lord Peter Wimsey once again, along with his manservant Bunter.