First publication of stories

The first UK magazine publication of all the stories has not been fully documented. The known listing is as follows:

• Magnolia Blossom: First published in issue 329 of the Royal Magazine in March 1926. The story first appeared in book form in the UK in the 1982 collection The Agatha Christie Hour (ISBN 0-00-231-3316) to tie in with a dramatisation of the story in the television series of the same name.
• The Love Detectives: First published in issue 236 of The Story-Teller magazine in December 1926 under the title of At the Crossroads. This was the first of a series of six stories in consecutive issues of the magazine titled The Magic of Mr. Quin. The remaining five were later published in book form in The Mysterious Mr. Quin in 1930. The plot has similarities to 1930 Miss Marple novel The Murder at the Vicarage
• Next To A Dog: First published in issue 295 of the Grand Magazine in September 1929.
• The Second Gong: First published in issue 499 of the Strand Magazine in July 1932. This story with Hercule Poirot was the basis of the novella Dead Man's Mirror in 1935.
• Problem at Pollensa Bay: First published in issue 539 of the Strand Magazine in November 1935. The story was illustrated by Jack M. Faulks. The detective is Parker Pyne.
• The Regatta Mystery: First published in issue 546 of the Strand Magazine in June 1936 under the title Poirot and the Regatta Mystery. The story was illustrated by Jack M. Faulks. The story was later rewritten by Christie to change the detective from Hercule Poirot to Parker Pyne before its first book publication in the US in The Regatta Mystery and Other Stories in 1939. The publication in the Strand Magazine remained the only publication of the original version of the story in the UK until 2008, when it was included in the omnibus volume "Hercule Poirot: the Complete Short Stories" (ISBN 978-0006513773).
• Yellow Iris: First published in issue 559 of the Strand Magazine in July 1937. This story with Hercule Poirot was the basis of the novel Sparkling Cyanide, in which Poirot was replaced by Colonel Race and the plot was heavily altered.

No magazine publication of The Harlequin Tea Set has yet been traced; the story was first published in book form in the UK in Winter's Crimes #3 in 1971 by MacMillan (ISBN 0-333-12871-0).