Parker Pyne Investigates

Parker Pyne Investigates is a short story collection written by Agatha Christie and first published in the UK by William Collins and Sons in November 1934. Along with The Listerdale Mystery, this collection did not appear under the usual imprint of the Collins Crime Club but instead appeared as part of the Collins Mystery series. It appeared in the US later in the same year published by Dodd, Mead and Company under the title Mr. Parker Pyne, Detective. The UK edition retailed at seven shillings and sixpence (7/6) and the US edition at $2.00.

The collection comprises twelve of her fourteen stories featuring detective James Parker Pyne; the two remaining stories, "Problem at Pollensa Bay" and "The Regatta Mystery" were later collected in The Regatta Mystery in 1939 in the US and in Problem at Pollensa Bay in the UK in 1991.

The book also features the first appearance of the character of Ariadne Oliver, who would go on to have a working relationship with Hercule Poirot in later books. Also seen very briefly is Pyne's secretary, Miss Lemon. It is a matter of spirited (although usually friendly) debate amongst Christie enthusiasts whether or not this character is meant to be Miss Felicity Lemon, who was later shown to be Poirot's secretary.