One, Two, Buckle My Shoe

One, Two, Buckle My Shoe (1940) is a novel by Agatha Christie. It is one of several of Christie's crime fiction novels to feature the Belgian detective Hercule Poirot.

The novel starts when a dentist Poirot visits is found dead in his office, holding a gun in his hand. Multiple ideas are suggested, most of them suggesting it was suicide, before another man is found dead. At that point, Poirot links the two deaths together.

The book from a well-known children's nursery rhyme. Other Agatha Christie books also share this, namely Hickory Dickory Dock. In the adaption to television, two girls are seen reciting the rhyme several times while playing outside the dentist's.