One, Two, Buckle My Shoe is a work of detective fiction by Agatha Christie first published in the United Kingdom by the Collins Crime Club in November 1940,[1] and in the US by Dodd, Mead and Company in February 1941 under the title of The Patriotic Murders.

At the time of publication, the novel was met with mixed reviews, as "compactly simple in narrative, with a swift course of unflagging suspense that leads to complete surprise.

As Poirot leaves the office, he encounters former actress Mabelle Sainsbury Seale as she exits a cab; he retrieves a lost shoe buckle for her.

Later that day, Inspector Japp informs Poirot that Morley has been found dead of a gunshot wound to the head, the gun in his hand.

Between Poirot's appointment and Morley's death, the dentist had seen three patients – Mabelle, prominent financier Alistair Blunt, and a Greek gentleman named Amberiotis.

Howard Raikes, an American left-wing activist who wishes to marry Blunt's niece Jane Olivera, left the office without seeing Morley's partner Dr Reilly.

The police conclude Morley accidentally injected the overdose, and committed suicide upon realising his mistake, but Poirot does not accept this view.

The two moved the body into a side room, and Gerda changed Mabelle's records to become those of Mrs Chapman and vice versa, to confuse the police.

Other Agatha Christie books and short stories also share this naming convention, such as Hickory Dickory Dock, A Pocket Full of Rye, Five Little Pigs, How Does Your Garden Grow?

"[5] In The New York Times Book Review of 2 March 1941, Kay Irvin concluded, "It's a real Agatha Christie thriller: exceedingly complicated in plot, briskly and compactly simple in narrative, with a swift course of unflagging suspense that leads to complete surprise.

"[3] Maurice Richardson in the 10 November 1940 issue of The Observer stated, "The Queen of Crime's scheming ingenuity has been so much praised that one is sometimes inclined to overlook the lightness of her touch.

"[6] The Scotsman of 26 December 1940 said of the book that, "Although motive is not of the obvious order, Mrs Christie deals with the mystery in the most ingenious way and, as usual, produces a masterly solution.

"[7] E R Punshon in The Guardian of 13 December 1940 summed up by saying, "Mrs Christie has to work coincidence rather hard and the plot is more ingenious than probable, since the culprit could, and certainly would, have reached his end by simpler means than murder.

"[8] An unnamed reviewer in the Toronto Daily Star of 15 March 1941 referred to the story as a "neat puzzle" having a "highly involved plot" with a "not-unforeseen solution."

The reviewer added, "the pace is swift and talk – curse of the English detective story – is kept to a minimum" and concluded by saying, "Far from usual is ... Christie's use of her thriller to expound a number of her own rather odd political opinions.

"[9] Robert Barnard wrote "It is usually said that Christie drags herself into the modern world in the 'fifties, but the books in the late 'thirties show her dipping a not-too-confident toe into the ideological conflicts of the pre-war years.